PP and I posted comments on the Cloverleaf antenna that just showed up in a video I posted in the Multirotor section (TriCopter video). I just bumped into what looks like a very detailed thread about building such an antenna. I'm posting this over here because it's much more a FPV topic. Here is the thread: http://www.rcgroups.com/forums/showthread.php?t=1388264 ...Tiger