I used Bob's "satgate antenna" page for my 145.825 igate. http://www.aprs.org/aprs-satellite-igate-antennas.html Not sure if that's what you're looking for, though. --Roy K3RLD Bob, when you say "big ground plane", how big is "big"? If you have a > link to the appropriate webpage on your APRS site, that would be great. > Thanks! Steve AI9IN