After much research, I went with a Comet 712-EFC. I've compared it to a few different antennas - including a 3db gain Sinclair, a 7.2 db gain Retevis MA 09 and a few others. The Comet delivers a lot of bang for very reasonable bucks. Our local amateur radio club was impressed enough that it decided to use it for the club's GMRS local repeaters, too.