Verticals
J-Poles
- ARRLWeb: VHF J-Pole Antenna
http://www.arrl.org/tis/info/JPole-V.html - The Copper Cactus
http://archimedes.galilei.com/raiar/cactus.html - Copper Dual-Band Super J-Pole
http://www.n7qvc.com/copper.html - Copper J-Pole 2 Meter Antenna
http://home.att.net/~dale.keller/ham/antenna/jpole.htm - Design Your Own J-Pole Antenna
http://www.packetradio.com/jpol.htm - J-POLE ANTENNA
http://www.vk1.wia.ampr.org/bulletins/jpole.html - TCARS Virtual Elmer - How to Build a 2-Meter J-Pole
http://www.tcars.org/elmer/jpole.html
J-Pole Choke
It is recommended that a current choke be used with the J-Pole when being fed with coax since it is an unbalanced feed-line. The choke helps keep the transmission line from radiating and altering the radiation pattern of the J-Pole. Most descriptions I have read have suggested four or five turns of coax within a 5 inch diameter loop.
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