The J Pole
The J Pole antenna is a popular antenna design among amateur radio operators because it is effective and easy to build.
It’s basically an end-fed omnidirectional half-wave antenna, matched to the feedline by a quarter wave transmission line stub.
Invented by the Germans as Balloon Antennas, and originally named Zepp’antennas can be considered a spin-off, or a modified WINDOM for VHF and UHF.
J Pole antennas are very efficient because they operate at harmonics of the fundamental or lowest frequency for which they are cut/designed.
Variations of this antenna, are Slim Jim antenna, Super-J antenna and the Collinear J-pole antenna.
Image courtesy of WikiPedia J-Pole Antenna
J Pole antenna projects
An Easy Dual-Band VHF/UHF vertical Antenna made with a TV twin lead and coax cable
Everybody says keep one in your bag, nobody seems to make one work right. Here's the straight scoop on why the J-pole is not an easy antenna to duplicate!
J-Poles with Wireman-cables for the quarterwave matching section, working on VHF and HF bands
This antenna is unique in that it is enclosed entirely in 3/4" PVC
Also known as the Backpacker's Delight Antenna. This Folding J Pole Antenna is the original design of Mike Heiler KA0ZLG and was featured on the Front Cover of the March 2005 QST Magazine.
A simple dual band VHF UHF jpole antenna Projects by Dale Kubichek
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