J-Pole antennas are a 1/2 wave element with a 1/4 wavelength matching stub. The Matching stub allows the dipole to be fed from the bottom end without interference from the feed line. Open Line (J), tapped coax, or LC Circuit can be used to match the dipole to a coax at the end, accomplishing the same performance, including the same overhead null one expects from a vertical dipole.

Art, KC6UQH

-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Andrew Rich Sent: Saturday, April 16, 2011 11:03 PM To: KF1BUZ Cc: AMSAT-BB@amsat.org Subject: [amsat-bb] Re: ground plane on

http://www.youtube.com/watch?v=L4v9wKMxRHQ&feature=youtube_gdata_player

Sent from my iPhone Andrew Rich

On 17/04/2011, at 15:53, KF1BUZ kf1buz@gmail.com wrote:

A Copper Jpole, has this been tried? Just thinking it might make my getting into the birds better.

Thanks Dan KF1BUZ

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