According to the W1GHZ antenna book at :
http://www.w1ghz.org/antbook/conf/Helical_feed_antennas.pdf
"The ground plane diameter is typically 0.94? in diameter" or about 25.25" for 440 MHz.
John WA4WDL
-------------------------------------------------- From: "Pete Norris, K1HZU" k1hzu@yahoo.com Sent: Thursday, June 03, 2010 8:51 PM To: amsat-bb@amsat.org Subject: [amsat-bb] HELIX REFLECTOR?
Hi All: I am rebuilding a 440 MHZ Helix that I built several years ago . It worked very well, but I would like to reduce the size of the reflector to a more manageable size than I had before. The only reference to reflector size I can find is, "minimum 20" ". I may be looking in the wrong places. I would appreciate it, if someone would steer me in the right direction. Thanks, Pete, K1HZU
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