fd4 antenna. 6m directional antennas with 5, 6 or 7 elements, 1 kW. fd4 antenna

 
 6m directional antennas with 5, 6 or 7 elements, 1 kWfd4 antenna  Fritzel Antenna Source? 9

Fritzel FD4 antenna, described by the late Dr. 201 - FD4 Windom Antenna for 80m, 40m, 20m, 10m. 8-m and 27. So I checked the frequency and had to adjust it (27MHz calibration)I'm just afraid that if we install a PayPal box at the LoTW page, paying can become mandatory before QSL-ing. 6-Band Windom antenna - Theory and construction of a novel trapless center-loaded off-center-f. Also, a power amplifier, L4B, is on the way to Baghdad. Fritzel FD4 antenna, band 80, 40, 20 & 10M plus 17 & 12M 13. post 26 Apr 2023. By serendipity, it also covers the 17 and 2 meter bands. VAT, plus shipping €63. During experiments with for example FD3 and FD4 types, I had noticed that there was a "Windom" point at a length of about 27 m. I recently purchased the 5KW FD4 from an MWF-SERVICE. 6O6X. Didn't think of the postal theft situation in many countries. 0 29. Simply push the waste into. Még lehet finomítani de már így is jó. Fritz Spillner, DJ2KY, in 1971. So here at my home there is also room for improvement. Here I have an FD4 Windom antenna running down the garden, this is an 80 metre dipole but fed offset (about 1/3rd of the way along it’s length) with a step down Balun to match the 50 ohm coax and has a fairly low SWR on 80, 40, 20 and 10 metres. I hope you enjoy this video and find it helpful. When the dipole is installed horizontally, at about one meter (3-4 feet) above ground, you effectively get a NVIS low-noise dipole. FD4 Antenna - 80-10m 3 el Beam TH3MK4 - 20-10 m Vertical UHF. Part Number: MFJ-1779A. The half-size version of the FD4 is known as the FD3 (40,20,10m) and is the subject of this article. First trim the dipole for resonance at about 3. VU2NSB OmniDX antenna (11m) VU2NSB OmniDX Antenna series is a very s. The windom antenna can also be hung as a. 5m and 2. A kada ima problema sa napajanjem, onda su problemi sa komšijama verovatni . 0 Extras: Using the Editor to Customize Your Transceiver. For a while now I used a 56 meter (184 foot) long horizontal loop, hung up in our back yard. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer inserted in the wire at one-third from one end Longwire antenna basics basic notes on building longwire antennas for medium waves 6-Band Windom antenna The FD4 (FD3) Windom Antenna - The 4-band Fritzel model FD4 is a special version of a Windom antenna. SWR is actually better with 300-ohm transmitting line than with the 450 ohm line normally used. vy 73 de Ron DG1HVW F4ATM Laurent schrieb: Hello, i need all lenghts of wires and balun type ( 1/6 or 1/4 )to make a Windom antenna 10m to 80m. 73 to all FT8/FT4 Digital Modes Group (Welcome To All Licensed HAM) | on air on 17 meters ,with 30 watts and fd4 antenna. Fritz Spillner, DJ2KY, in 1971. factory sound when I plug in my Mp3 player into the radio and didn't want to use one of those units that goes into the antenna and is. Vous connaissez les FD4/FD3 ? vous connaissez les loop ? vous connaissez les halo ? je vous propose sur une idée de G8ODE , dérivé de l'antenne "Cola" l'antenne "OLA" pour Open Loop Antenna (feed off center) une FD4/FD3 a une impédance de l'ordre de 200/300 ohms , si cette antenne est replié en triangle ou carré son impédance descends. T2FD. power 1 kW, approx. I still young so I thinks this is normal, didn't we all start small. pc is a toughbook cf19 wx is quit good,strong winds, 9 xxxx & yyyy are the names of the two participants. The half-size version of the FD4 is known as the FD3 (40,20,10m) and is the subject of this article. The renowned “FD4” antenna was not an exception; Have a look at its VSWR specification on pages 13 and 14 of this brochure. Ako bi već moralo, onda može biti zgodna kombinacija ukrštenog dipola za 3. 7-m in the. 202 - Two Elements Phased Delta Loop for 40m. isolators. Details and QSL info is in qrz. com in a single category. ic7800 @ 100w microkeyer ii - heil proset elite - cushcraft r6000 and fd4 antennas - n1mm logger. 1971 - Dr. 0: We discuss Antennas, DX'ing, Calling CQ, and other Topics. Operating HamSphere 4. . &lt;&lt; serial ‘ngobrol-‘ngalor-‘ngidul ihwal per-antenna-an bersama bam, ybØko/1 &gt;&gt;. t to. Coax fed OCF ‘Windom’ antenna. Ožujak 2004, 14:46:50 ». The Fritzel FD4 antenna becomes more popular in Europe and N. Este diseño también presenta unos bigotes de gato para trabajar las bandas WARC y los 15m. 5dBdA («fig) 6 ÷ 1 balun of FD3 and FD4 antenna's has the same size as a 1 ÷ 1 balun. The FD4 (FD3) Windom Antenna The 4-band Fritzel model FD4 is a special version of a Windom antenna. RF-1936/38 Portable Crossed-Pole Antenna Series MECHANICAL RF Connector Side feed with wing nut. This has also been the case in Germany. Fritzel used the shown dimensions of 13. In addition to the wire antennas, in Europe they sell a line of yagis and verticals, and are well respected. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. I've certainly experienced postal theft of my SAE + GS mailings and was only able to secure some difficult to get countries though email discussions and the kind co-operation of the DX stations/ Managers to send me cards at their expense or having them identify a secure route. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer inserted in the wire at one-third from one end. Most tuners would work better if the balun passed the line impedance through without stepping impedance down. The main category is Dipole antenna that is about Dipole antennas plans. But for a "real" FD4 the RF transformer should have 4:1 or as some say 2:1 when the height above ground is small. OZ0RF. At this moment I have to spend my money in a "better" way. Watch on. By the end of the 70's interest in the Windom. America. Fritz Spillner, DJ2KY, in 1971. Military AS-2259/GR There are a number of different NVIS antenna plans on the internet that can be adopted to amateur radio use. com in 2 categories. The main category is Windom antenna that is about Windom antenna links. I…However although the antenna wires are strain relieved at the Balun. 47 kB, 1280x1024 -. . A shorter version FD3 for 40-10m operation is also developed. Antenna Windom Links → . , 4 times) over a simple low dipole are possible • Consider horizontal loop or Lazy H over aOur experts are there to help you in word and deed - independent of the frequency range and radio application. 6m directional antennas with 5, 6 or 7 elements, 1 kW. It covers 7 bands, 10-12-15-17-20-40-80m. For best results with this type of antenna, the Apex Angle should be kept between 70 and 110 Degrees . You have tried to build an FD4 antenna which is no bad solution at all. By 1937 the Windom was described “as multi-band antenna that can be employed on harmonically related 160, 80, 40, 20 and 10m bands with acceptable levels of VSWR”. Fritzel used the shown dimensions of 13. click here to follow the link to The FD4 (FD3) Windom Antenna. vy good fr emcomm. antenna. Fritzel used the shown dimensions of 13. Fritzel used the shown dimensions of 13. 0 Extras: Using the Editor to. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer. antenna systems are easily carried and installed by two people in less than 15 minutes. 203 - Three Elements Wire Yagi for 10m. com. By serendipity, it also covers the 17 and 2 meter bands. 25 10. 1st xmission 15 dB above city noise level, 2ns xmission abt 10 dB. 00 €. Produce baluns, delta loops, dipoles, ocf antennas and more. if you want to rate The FD4 (FD3) Windom Antenna use this special. balun, incl. pc is a toughbook cf19 wx is quit good,strong winds, 9 xxxx & yyyy are the names of the two participants. But it was over water, the villa pool hi. Name: Fritzel FD4 HAM radio antenna. Both of these proved toKite-borne FD4 antenna as designed for winds of 11 — 15 knots. Military AS-2259/GR There are a number of different NVIS antenna plans on the internet that can be adopted to amateur radio use. We discovered in an older periodical (QRV) the explanation by F. Tether for side kites 7. Yeasun FT 857 D. If the installation site permits, a dipole antenna in a vertical "Vee" configuration has radiation patterns suitable for NVIS applications -- and can have useful low-angle radiation, as well. As at the way things are now all that will happen is Olivia will get a number of FT8 stations annoyed. 16. This split allows the OCFD to be operated as a 4 band antenna as the SWR on the 40m band is less than 3. Configure & Download. • Radioddity's limited warranty applies to all BRAND NEW items sold by radioddity. Unlike the endogenous expression of the fd4/fd5 genes, the C element is not restricted to the ventral imaginal discs (legs and antenna), as activity of this CRM is also observed in the wing disc. Date: Wednesday, March 24, 2010, 8:24 AM. FD4's are by wide ranges. Balun C. Spillner (DJ2KY) that this antenna, with the addition of a small one-band Windom for 15 m, can be used. 00 €. This Windom antenna was marketed in the late 70's and early 80's as Smithe's Windom. The Fritzel FD4 antenna becomes more popular in Europe and N. 5. 26 Inch High Gain Antenna (Original Baofeng GT-3/GT-3TP Antenna) 1 Year and 6 months Manufacturer's Warranty. One would argue that the stations worked would simply mail some funds to these DXpeditions to offset the lost income included with QSL requests. antenna. i missed the russian stations!! oq5m: on5zo or6t: oq4u on5xx on4qj or7r: on4lg ot2j: ot2j on6ix on7vg on3daf pa0rsm first time uba contest: pa3cgj not so many time to participate. Add a comment. The antenna was clipped to the RTL-SDR V3 antenna base without the telescoping whip – alligator clipped to the threaded mast. Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. But it was over water, the villa pool hi. Hi all, I bought the Mini1300 from China and Software says Version1. 5-8800 MHz) CHARACTERISTICSname xxx qth winterthur near zurich this is my first qso on js8, funny . Available in: Asia. This link is listed in our web site directory since Thursday Jun 23 2016, and till today " HF Linked Dipole Antenna Calculator " has been followed for a total of 1468. Add To Cart. Hari Wire Groundplane Antennas. The Fritzel FD4 antenna becomes more popular in Europe and N. I hear one friend say me " Dipol antenna or multi band FD3 or FD4 need minimum 8 meter up the ground or roof" is correct ? I cant up 8 meter over the my roof max. Only good results on 80 and 160 meter bands in combination with a MFJ 969 de luxe versa antennatuner. com. It is used for military and paramilitary communications, broadcasting, [1] especially in the tropics, and by radio amateurs for nearby contacts circumventing line. I did follow the instructions and entered my Call and Locator, selected port S1 and connected FD4 antennaadding two wires to the basic FD4, 4. Latin America. 8 - An antenna system for 7, 14 and 21 Mc. 0: We discuss Antennas, DX'ing, Calling CQ, and other Topics. WINDOM. If you make an FD3 or FD4 yourself and use this tuner, you can as well place a 1 ÷ 4 balun with good results. 3. This antenna was developed in Germany, although others likely advanced it also. See physical description below. Fritz Spillner, DJ2KY, in 1971. Can someone point me to or post the latest Olivia Dial frequencies with 1500 offset? Everywhere I look, I see something different. The Fritzel FD4 antenna becomes more popular in Europe and N. 7-m in the 1960s. 52m long ( TT, October 1972 and ART): Fig 5. About The FD4 Windom antenna The resource is currently listed in dxzone. hofi de) . Fritzel FD4 antenna, described by the late Dr. 8-band antennas need 239 feet of ground space end-to-end. Fritzel used the shown dimensions of 13. One would argue that the stations worked would simply mail some funds to these DXpeditions to offset the lost income included with QSL requests. WINDOM. Belakangan, karena di feed di titik yang melèncèng dari tengah bentangan antenna (OFF-center) seperti yang kemudian umum dilakukan, maka rancangan ante nna macam ini lantas disebut sebagai off-center fed atau OCF antenna. but it was nice to meet you. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. Do long wires work better than say a standard half wave or quarter wave antenna?Ask an Elmer discusses this very interesting question by one of our viewers. A Portable NVIS Antenna is QRP-Friendly. University merilis tulisan tentang cara menala half -wave antenna dengan pengumpanan lewat single wire ini. Later a installed a small dipole antenna and during the weekend I worked about 60 QSO and logged about 44 squares all via ES. 4:1 on the 20,15,10m bands Graphics by G8ODE June 2012 iss 1. Rating & Comments (0) Tags (7) Alternate Versions. 0 Extras: Using the Editor to Customize Your Transceiver. PolyStealth Tm high strength PE insulated antenna wire, and Flex-Weave Tm wire. . The dual dipole wires do the job of providing guying support for the mast. Mire jó még a Smith diagram segítségével mért eredmény? Ha ez pl. The half-size version is known as the FD3 40-20-10m antenna. I asked my landlord for the possibility to fix one end of it on his house. So I checked the frequency and had to adjust it (27MHz calibration) But still. This antenna was developed in Germany, although others likely advanced it also. EMEA. (Note the FD3 will also be around 66 feet total length for operating on 7 MHz and. Fritzel FD4 OCFD (10-80m) Fritzel FD4 OCF Dipole Fritzel FD4 OCF Dipole The Frizel FD4 Windom is an OCF (Off Centre Fed) antenna that has been around for a long time. Ne postoji dobro multiband rešenje. A shorter version FD3 for 40-10m operation is also developed. More bandwidth can be obtained with the rolled up ribbon stub system («fig). H. Our new portable Dipole antenna set with mounting kit. This is a pity, because most hams would put up a wire antenna especially for the lower bands where beam antennas are more difficult to erect. Belakangan, karena di feed di titik yang melèncèng dari tengah bentangan antenna (OFF-center) seperti yang kemudian umum dilakukan, maka rancangan ante nna macam ini lantas disebut sebagai off-center fed atau OCF antenna. K1POO 4 Band Off Centre Fed Dipole (40-20-15-10m ) To demonstrate the accuracy of the MMANA-GAL model of the K1POO antenna, the results from the MMANA-GAL program and Rob’s (M0RZF) Vector Network Analysis are shown below. For the PAL-OCF8010 with 250 feet of RG213 feed line and an average height of 30 feet: Palomar Engineers PAL-OCF8010 Antenna manual 05242021 29. 7-m in the 1960s. A shorter version FD3 for 40-10m operation is also developed. I'm using homebrew Windom-Antenna recently. « u: 31. 5 and 28 Mhz. Antennas such as G5RV with balun, W3DZZ, FD3 and FD4, trap verticals and Yagis can be easily adjusted with a FRI Match. Fritz Spillner, DJ2KY di tahun 1971dan diproduksi secara komersiil dengan nama Fritzel. The plot shows the current distribution on a 42 m long FD4 Windom antenna for the frequencies 80, 40, 20, 17 and 10 m. Fritzel FD4 antenna, described by the late Dr. I have it mounted flattop up about 45 feet. As low as: €75. He will be active for the next three years from the Slovak Ambassy in Baghdad. 8-m and 27. Since it is resonant on multiple bands the signal level at the receiver is high. 6. Item number # 425fd41503. Mange kortbølgeamatører har glæde af en FD4. Fritzel FD4 antenna, described by the late Dr. 202 - Two Elements Phased Delta Loop for 40m. That should be a good anchorpoint to mount my X200 and a wire antenna for HF. The GPA-30 trap was used because water often seeps in with an R6000 trap and the construction is not as robust as that of Fritzel antennas. Watch on. com and other authorized dealers (except Xiegu). pc is a toughbook cf19 wx is quit good,strong winds, 9 xxxx & yyyy are the names of the two participants. At a first glance, the antenna looks like an Off-Center-Fed Dipole (OCFD). One would argue that the stations worked would simply mail some funds to these DXpeditions to offset the lost income included with QSL requests. Fritz Spillner, DJ2KY, in 1971. Add to Cart Details. The 4-band Fritzel model FD4 is a special version of a Windom antenna. 00. Ultra Vizion HD Digital TV Antenna: $44. Signal war mit etwa 15db über dem Rauschen deutlich zu. When the dipole is installed horizontally, at about one meter (3-4 feet) above ground, you effectively get a NVIS low-noise dipole. 5m and 2. We discovered in an older periodical (QRV) the explanation by F. I did follow the instructions and entered my Call and Locator, selected port S1 and connected FD4 antenna but nobody does receive me. FD4S-B288S00JDB2. A shorter version FD3 for 40-10m operation is also developed. Sometimes, all you can use for 40 m field work is a low-slung portable dipole antenna. 50 m 32. Fig. Actually I could not get out of Europe on it. 6m is also dead, useable only for experiments and local contacts here. The old Y-Calls had to change in 1992 and I got DL1JBQ. BEST COMPACT: Antennas Direct ClearStream 4V Long-Range TV Antenna. Délután 4-re már állt az FD4 antenna és az azt tartó pecabot. 5; 7; 14; 18; 28 MHz-en. The FD4 is almost ready, but the weather hasn’t cooperating lately. If the installation site permits, a dipole antenna in a vertical "Vee" configuration has radiation patterns suitable for NVIS applications -- and can have useful low-angle radiation, as well. Description: Fritzel FD4 HAM radio multyband HF antenna. ASUS AX3000 Dual Band PCI-E WiFi 6 (802. Hari Wire Groundplane Antennas. 11a band is. The newer baluns are suited for more power, output 700 W/CW and 1400 W/SSB. The antenna was designed for military use from 2 to 10 MHz (some references say 2 to 30 MHz). The wire tails connecting to the Balun Bolts are just ordinary Philips Spades. A shorter version FD3 for 40-10m operation is also developed. It may cost a little more, but the Winegard Elite 7550 pays dividends, delivering a whopping 73. Study of the Off Centre Fed Dipole Antenna - G8ODE Short Long Feed point The Off Centre Fed Half-wave Dipole The Off-Centre Fed Half-Wave Dipole, more commonly referred to as the OCFD, is very popular because it offers good performance as a multi-band antenna using an antenna matching unit in conjunction with a 4:1 or 6:1. University merilis tulisan tentang cara menala half -wave antenna dengan pengumpanan lewat single wire ini. D. The resource is currently listed in dxzone. Operating HamSphere 4. As low as: €240. The Fritzel FD-4 was designed by He. Rating & Comments (0) Tags (7) Alternate Versions. antenna systems are easily carried and installed by two people in less than 15 minutes. DJ2KY di tahun 1971dan diproduksi secara komersiil dengan nama Fritzel FD4 antenna. power 1 kW, approx. For the PAL8010OCF,. Source for Fritzel Antennas? 10. rig is a codan 2110v 25w fd4 antenna 15ft above ground yyyy, ur station is amazing! do u qsl js8. The fundamental ideaWith some very old antennas the traps of radiator and director are equal. . 0, but I wonder how to send WSPR or FT8. Bandwith 150Hz. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer inserted in the wire at one-third from one end. incl. The main category is Windom antenna that is about Windom antenna links. This antenna also works fairly well on all odd harmonics,The asymmetrical dipole antenna developed and described by Windom (W8GZ) in 1929 has been used by many amateurs for many years as the FD4. Rest assured, both problems are dealt with by the CL-OCFD, also list-ed at the bottom of Table 1. 1971 300 Ω 41. This ATU, I call my design FRI-Match, has been devised in 1972 as an unbalanced tuner for improving the SWR at the transmitter end of coaxial feeders to resonant antennas (eg verticals, dipoles, trapped dipoles, G5RVs, Yagis, loopquads etc. It had the same dimensions as the multiband Windom antenna, but fitted with a 200Ω (4:1) balun at its feedpoint and fed with coax. This can overload the receiver, especially on 40 m here in Europe, with a lot of broadcast stations. TA4AU. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. If it had been a Philips crimped on Eyelet that would have been better. Antenna short 25ft off centre dipole OCD tied to balcony rail 15 feet high sloping down to 8 feet into hibicus bush. 5m so chesen that the may not only r t radio Apart the in no other For this they and weather The highlight of this antenna is the balun, THE OCF FD4 (FD3) WINDOM ANTENNA FD4 (80/40/20/10 m) The 4-band Fritzel model FD4 is a special version of a Windom antenna. I was using only 30 wtts and FD4 antenna and enjoyed vy much, 73 to all . What became perhaps the most popular multiband Windom design of all, was the German-made Fritzel FD4 antenna, described by the late Dr. Vous connaissez les FD4/FD3 ? vous connaissez les loop ? vous connaissez les halo ? je vous propose sur une idée de G8ODE , dérivé de l'antenne "Cola" l'antenne "OLA" pour Open Loop Antenna (feed off center) The renowned “FD4” antenna was not an exception; Have a look at its VSWR specification on pages 13 and 14 of this brochure. 5-70. Coax extension2020-06-21 : Tried 6 m with my IC-7300 and a FD4 antenna. ' IS (MHz) so. Hy Power Antenna Company - US amateur radio antenna manufacturer. COM in Germany because the exchange rate for euros was low. The AS-2259 Antenna. 155. De tråde som Verner//OZ9XU anbefaler dig at montere, giver glimrende resultater. . I still young so I thinks this is normal, didn't we all start small. EN. Also, why every house should have an emergency way of listeni. Did you try NVIS? Pretty fun here with EFHW-80-10 5 meter high in the. The Fritzel FD4 antenna becomes more popular in Europe and N. FT-7's PB-1631 B was modified according to FT-7B's PB-1631 D. 8-m and 27. 4+4. fd4_hg7wav. It covers 7 bands, 10-12-15-17-20. Australia/New Zealand. A 1 ÷ 6 auto transformer matched the antenna to the 60-On one occasion when the steward helped Vasek put his luggage up in the board case, she strictly refused the suitcase above any person and Vasek had to move with it the tail of the aircraft. ----- Original Message ----- From: "Gerry Hohn" <telwest@. It will match on even and odd harmonics - but it requires a complex balun at the feedpoint. Fritz Spillner1, DJ2KY, in 1971. The asymmetrical dipole antenna developed and described by Windom (W8GZ) in 1929 has been used by many amateurs for many years as the FD4. Hello, it was a good signal in nort west Germany. University merilis tulisan tentang cara menala half -wave antenna dengan pengumpanan lewat single wire ini. 70cm directional antennas with 16 -. vy good fr emcomm. And the length of the legs must match. Hi all, I bought the Mini1300 from China and Software says Version1. Fig. egy egysávos antenna lenne és az Ohmos összetevő 50 Ohm környékén lenne akkor ha induktív reaktanciát mérünk, akkor egy azzal egyenértékű reaktív. My HF Antenna Fritzel FD-3. Just wanted to let you know about the success I have had with an antenna project from your web site; 20 Meter "Vertical Zepp Dipole" Antenna by Carl H. Hi all, I bought the Mini1300 from China and Software says Version1. If the insulator has been exposed to our climate for some time, the resin "evaporates" on the surface. 5. 03. 3 m dia loop and E field antenna, 2. Sark100 antenna analizátor. but it was nice to meet you. In this study, a compact 2 × 2 circularly polarized (CP) sequentially rotated (SR) dielectric resonator antenna (DRA) array operating in the IEEE 802. Description: Fritzel FD4 HAM radio multyband HF antenna. The half-size version is known as the FD3 40-20-10m antenna. To: n4ujw@hamuniverse. New Carolina windom antenna - PDF file by QRP Expressions by By N. OK2SWD. 2 29. It turns out that 100 feet of line is within about 10% of the idea length to match the antenna to 50 ohms on all amateur bands. WINDOM. One should use an extra 1 ÷ 1 balun or choke balun to prevent radiation of the coax screen. On 40m, 20m and 10m it works nicely, as one would expect for this type of antenna. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer inserted in the wire at one-third from one end Longwire antenna basics basic notes on building longwire antennas for medium waves 6-Band Windom. It was designed to cover 80, 40, 20 15, and 10 meters. The Fritzel FD4 antenna becomes more popular in Europe and N. Operating HamSphere 4. DK2CF IC-7400 100Watt Dipole and Delta loop DK4WF FT-890 FD4 Windom 17m high DL7JOM K3 750W LPDA DL7ULM IC706 Indoor-dipole 2 x 11 metres FD4 de chez Fritzel - Antenne. Antenna Part#: PAL-OCF1606 OCF antennas are very convenient as they will allow multiple bands of operation with a simple wire antenna which is fed off center. 6-Band Windom antenna. In addition the T2FD has some attractive properties in terms of noise reduction, which some long wires / dipoles and ATU combinations are susceptible too.