Hi all, I use a Symmetricom 58532A, they have a gain of 30 - 38dBi. Just what you need for a deaf Tbolt on the end of a long coax run :) You can buy them off eBay for ~$30 each http://cgi.ebay.com/Symmetricom-58532A-N-type-female-GPS-antenna-antenne-/230568432072 regards Tim -- VK2XTT :: QF56if :: BMARC :: WIA :: AMSAT-VK :: AMSAT