The one circle c recommends. The one I built just out of extenable antenna and connectors from radio shack I like it most of all because it fits in my pack easy and while it is not tuned just right it has yet to not pick them up in draws distance I have never tried I might do that tomorrow
http://www.easttexashogdoggers.com/forum/index.php?topic=16465.0;wap2