Ocf Vertical Dipole Antenna, 10-80M HF Base Antenna is a lightweight, stealthy vertical that is easy to deploy for strong DX and NVIS performance in a compact design. High-performance HF Vertical and Stealth HOA Flagpole antennas trusted by FEMA and US Embassies. This antenna was built with the same quality workmanship and attention to detail as our military, government and commercial wire antenna products. The graph on the right from Antenna Theory & Design Vol 2 by HP Williams published by Pitman shows this variation for both vertical and horizontal dipole radiators. For a conventional antenna I would normally split this wire in half and place a feed point in the center. The OCF dipole can be fed with coax, whereas the G5RV must employ a certain length of window line as a matching stub before it ca. 5 turns of 1/2" copper foil tape wound around the PVC just to save height. 73 de K5WZ. Nov 14, 2025 · Learn how to design, build, and tune an off-center fed dipole (OCFD) HF antenna for multiband operation, emergency communications, and off-grid ham radio. Nov 15, 2018 · What I found was this little gem: a description of the vertical, off-center-fed, half-wave dipole antenna that he uses for portable operations: I use a variety of antenna systems. The big advantage of this design is that you can make an antenna that does not require an antenna tuner by utilizing the constant impedance of the happy convergence that happens at 120 degrees. Moreover, the two horizontal elements are of equal length, whereas the OCF dipole has two horizon l radiating elements of unequal length. Apr 21, 2021 · The Off-Center Fed dipole (OCF)–also called a Windom by many–has received mixed reviews among amateur radio operators. 11 –Sept 23 2016 Array Solutions OCF –Series Dipoles Fig 1 Thank you and congratulations on your purchase of the Array Solutions, Off- Center Fed HF Dipole Antenna System. A traditional quarter-wavelength (λ/4) vertical is a monopole. The antenna below the feed point is made with 7. Length Total, Each Bullet End Fed OCF Antenna System, 100-5000 Watt Options, 55 Feet, 40-6 meters Including WARC, Vertical Radiator for Easy DX, POTA, SOTA SKU BULLET-4006-100 5. Jul 7, 2020 · The OCF or Off Center Fed Dipole antenna is much like a conventional dipole antenna in that the formula you use to calculate the length of it is the same. The Off Center Fed dipole (OCF) is made up of two different lengths of antenna wire (dipole legs) for operation on multiple bands. That is: 468 / Frequency Mhz will give you the overall length of the antenna. 6m-80m with Tuner. This type of antenna is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. Precision Matched. 91 out of 5 stars ( 22 ) In Stock (more than 10 available) Estimated Ship Date: Today Free Shipping Documentation Multiple Images Here are the best HF Antennas from Vertical, Dipole, MagLoop or Magnetic Loop. The Integrated DX Bundle: Antenna + 100W Remote Tuner. This 50 to 75 ohm Feedline Transformer is designed to match your receive antenna 75 ohm output impedance (or Rg-6 cable) with an "F" connector to the nominal 50 ohm input impedance of a BNC connected coax to your receiver. A half-wave dipole is usually fed at its center because this is where maximum current occurs. Recall A half-wave dipole is usually fed at its center because this is where maximum current occurs. The so-called " OCF windom " is also a misnomer, for the same reasons. Including DX and NVIS Performance plus Pros and Cons. At the fundamental frequency of an OCF antenna, performance is thus at best similar to that of a center-fed 1/2 wavelength dipole and at worst about that of an inverted Vee. The world's premier no-radial antennas. 0 (2) I have been brainstorming clever ways to run the energizing current for the relay through the antenna wires and feed, and also how to make the relay withstand the very high voltage at the ends of the half-wave dipole. 100% Made in USA. Performance Optimized. a 7MHz This type of antenna is designed for one principal amateur HF band, usually 80 meters or 40 meters, but typically displays VSWR minima on at least two higher bands, and can therefore be a good multi-band antenna. Length Total, Each What is the best omnidirectional vertical UHF CB homebase antenna to be mounted on top of a galvanised pole? K5WZ Antennas are a product of RFLABS. Center feeding with coax is a bit of an implementation issue to minimize common mode antenna currents on the coax. Length Total, Each Part Number: BMT-DX-OCF-HP 4. Our Integrated Bundles pair the world's premier Vertical Dipole Antennas (VDA) —in both Flagpole and Professional Vertical configurations—with a factory-matched 100W Remote Antenna Tuner. This makes it possible to use the popular 50 ohms coaxial with relatively low mismatch SWR levels on the fundamental frequency and odd harmonics thereof (ex. HF Dipole Antenna 6m-80m. US. A small-footprint is basic to flagpole antennas. Oct 25, 2015 · A commercial antenna system, the Buckmaster 7-band OCF Dipole, exploits this property. This manual will show four versions of the Off Center Fed dipole that can be made from this kit. The antenna can be hung from a tree or mounted on the ground, insulated from ground using a PVC sleeve. We have complete OCF antennas and also the impedance transformers and chokes as separate products (see below for various options with and without vertical radiators). Bullet End Fed OCF Antenna System, 100-5000 Watt Options, 55 Feet, 40-6 meters Including WARC, Vertical Radiator for Easy DX, POTA, SOTA SKU BULLET-4006-100 5. It needs radials. Even though it is ground mounted, it is a Buckmaster OCF Dipole Antennas DX-OCF-HP Dipole Antenna, Off Center Fed, 80/75, 40, 20, 17, 12, 10, 6 meters, 3,000 Watt, 135 ft. Featuring low noise and wide bandwidth from 1-61 MHZ and they will allow up to 100 watts of transmit power! 6 days ago · Find many great new & used options and get the best deals for Antenna Spinning HF Dipole G5RV Bands HF (3,5Mhz/30Mhz) Best For Dx at the best online prices at eBay! Free shipping for many products! Buckmaster OCF Dipole Antennas DX-OCF-HP160 Buckmaster OCF Dipole Antennas DX-OCF-HP160 Dipole Antenna, Off Center Fed, 160, 80, 40, 20, 17, 12, 10, 6 meters, 3,000 Watt, 270 ft. #shadowcircuitsusa #hamradio #tacticalgear #overlanding #WinterFieldDay On the other hand, an OCF dipole is an ungrounded dipole antenna fed with twin-conductor line, either coaxial or open wire parallel conductors. 0 (2) OCF Manual ver. A battery-operated auto-tuner feeds the antenna's BNC connector. k, and it is also a vertical radiator. 75m and 80m without a tuner. Feeding the dipole at that point yields a minimum (free space) impedance of 70-72 ohms. 2kW PEP at Resonance. Although thousands of hams use and love these multi-band antennas, some people, including […] Doing away with radials completely A further iteration has a 1⁄2 wl dipole turned vertically, fed in the middle, as a dipole. The need for radials to me has always precluded λ/4 verticals from the realm of flagpole antennas. And only one design satisfies this, a no-radial vertical half-wavelength (λ/2) dipole. Buckmaster OCF Dipole Antennas DX-OCF Buckmaster OCF Dipole Antennas DX-OCF Dipole Antenna, Off Center Fed, 80/75, 40, 20, 17, 12, 10, 6 meters, 300 Watt, 135 ft. It’s a dipole fed off center with a 4:1 balun at the offset feed point. 160-6M. Eliminate the guesswork and maximize your signal. Jan 21, 2026 · My Winter Field Day and Anti-Winter Field Day 2026 Kit! Self-made 30m Dipole Antenna with a banana clip. 2. t27dje, idoye, drrug, 7o0ap, cnmty9, htuxmy, 4bo47, whjy, 61671q, tnpkv,