ANTENNAS
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50:100 (2:1) CUBE™ Balun/Unun 1.8-61 MHz, 2KW/5KW, Loop Antennas50:100 (2:1) CUBE™ Balun/Unun 1.8-61 MHz, 2KW/5KW, Loop AntennasSKU CB-2-2000EBList price $159.95 Save 19%$129.95On Sale
50:450 ohm (9:1) CUBE™ Unun, 1.8-61 MHz, 1.5 KW, End Fed Long Wire50:450 ohm (9:1) CUBE™ Unun, 1.8-61 MHz, 1.5 KW, End Fed Long WireSKU CU-9-1500List price $129.95 Save 15%$109.95
Bullet End Fed Antenna System with 9:1 Matching Unit, Antenna Wire, + Feedline Choke - 100/500/1500 Watt, 41' (40-6M), 71' (80-6M)/111'(80-6), 155'(160-6M)/173'(AM, 160-6M) Options - FREE USA ShippingBullet End Fed Antenna System with 9:1 Matching Unit, Antenna Wire, + Feedline Choke - 100/500/1500 Watt, 41' (40-6M), 71' (80-6M)/111'(80-6), 155'(160-6M)/173'(AM, 160-6M) Options - FREE USA ShippingSKU BAS-41-100$109.95On Sale
Bullet End Fed OCF Antenna System, 100-1500 Watt Options, 25 Feet, 20-6 meters+WARC, Vertical Radiator for Easy DX, SOTA, POTABullet End Fed OCF Antenna System, 100-1500 Watt Options, 25 Feet, 20-6 meters+WARC, Vertical Radiator for Easy DX, SOTA, POTASKU BULLET-2006-100List price $179.95 Save 33%$119.95On Sale
Bullet End Fed OCF Antenna System, 100-5000 Watt Options, 55 Feet, 40-6 meters Including WARC, Vertical Radiator for Easy DX, POTA, SOTABullet End Fed OCF Antenna System, 100-5000 Watt Options, 55 Feet, 40-6 meters Including WARC, Vertical Radiator for Easy DX, POTA, SOTASKU BULLET-4006-100List price $189.95 Save 26%$139.95On Sale
Bullet End Fed OCF Antenna System, 100/500/1500/5000 Watt Options, 95 Feet, 80-6 Meters + WARC, Vertical Radiator for Easy DXBullet End Fed OCF Antenna System, 100/500/1500/5000 Watt Options, 95 Feet, 80-6 Meters + WARC, Vertical Radiator for Easy DXSKU BULLET-8006-100List price $239.95 Save 25%$179.95On Sale
CUBE Feed Line Choke/Line Isolator Unun, 1.5KW, 1.8-65 MHz, -38dB SuppressionCUBE Feed Line Choke/Line Isolator Unun, 1.5KW, 1.8-65 MHz, -38dB SuppressionSKU CU-1-1500SOList price $149.95 Save 27%$109.95On Sale
Multi Ratio 4:1/6:1/9:1 CUBE™ Balun, 1.8-61 MHz, 1.5 KWMulti Ratio 4:1/6:1/9:1 CUBE™ Balun, 1.8-61 MHz, 1.5 KWSKU CB-4-9-1500List price $149.95 Save 13%$129.95On Sale
Multi Ratio 50:200 (4:1) & 50:450 (9:1) CUBE™ Unun, 1.8-60 MHz, 1500W PEP, End Fed AntennasMulti Ratio 50:200 (4:1) & 50:450 (9:1) CUBE™ Unun, 1.8-60 MHz, 1500W PEP, End Fed AntennasSKU CU-4-9-1500List price $169.95 Save 24%$129.95On Sale
Off Center Fed Dipole Antenna, 20-6 Meters, 500/1.5KW/5KW PEP rated - FREE shipping in USAOff Center Fed Dipole Antenna, 20-6 Meters, 500/1.5KW/5KW PEP rated - FREE shipping in USASKU PAL-OCF2006-500List price $199.95 Save 30%$139.95On Sale
Off Center Fed Dipole Antenna, 40-6 Meters, 500/1.5KW/5KW PEP rated, POTA, SOTA - FREE shipping in USAOff Center Fed Dipole Antenna, 40-6 Meters, 500/1.5KW/5KW PEP rated, POTA, SOTA - FREE shipping in USASKU PAL-OCF4010-500List price $279.95 Save 46%$149.95On Sale
Off Center Fed Dipole Antenna, 80-6 Meters (9 bands-including 15 meters), 500/1.5KW/5KW PEP rated - FREE shipping in USAOff Center Fed Dipole Antenna, 80-6 Meters (9 bands-including 15 meters), 500/1.5KW/5KW PEP rated - FREE shipping in USASKU PAL-OCF8010-500List price $359.95 Save 53%$169.95
HF 1-61 MHz coax feed line common mode chokes
ANTENNAS
1:1 feed line Chokes (also known as feed line current chokes, common mode chokes, line isolators, current mode chokes, and 1:1 baluns/ununs) are available in kit form or assembled form in a weatherproof Current Unun and Balun Enclosure which we call a CUBE™. All 1:1 chokes are ferrite based and are designed for 50 ohm coaxial cable input and 50 ohm output. 1:1 Ferrite toroidal or bead chokes have a higher choking impedance than our popular Sleeve Chokes and various models are available for specific frequency ranges and power levels.
1:1 Chokes are useful for choking common mode currents that may flow on the exterior of the coax cable shield while allowing the signals on the interior of the shield and the center conductor to flow unaffected and keeping the common mode current on the antenna. They isolate the coax shield and prevent it from becoming part of the antenna system.
1:1 Chokes are useful between balanced lines for center fed dipoles at their fundamental frequency (468/f (MHz), beam antennas with a 50 ohm balanced driven element, G5RV, loops, yagis, NVIS antennas, mobile installations, portable antennas and anywhere common mode current (or RFI) is a problem. They are also helpful between transmitter and linear amplifier or between linear amp and antenna tuner or as isolation chokes where higher choking impedance is needed (in the range of 2K-7K ohms).
1:1 Chokes are also very useful as feed line current chokes at the “radio end” of the antenna (we call them coax noise filters) where they choke/filter common mode current induced onto the coax shield from radiated waves (from your antenna, and other sources such as DSL routers, computer devices, plasma TVs, etc. originating in your house or your neighbor’s house). For RFI issues see RFI/EMI Solutions for general use or for specific radios and devices.
For best results we recommend a 1:1 choke at the “antenna end” of the coax and a coax noise filter at the “radio end” of the coax. (A side benefit is a reduction in noise level caused by common mode currents). 1:1 chokes are also available as Sleeve Chokes (Slip on or Snap on) for ease of installation and light weight on the antenna.