You really don't need much in the way of an antenna. The antennas I suggested in my previous post work, the QHA antenna suggested by another is also going to work. I like the initiative of building antennas, I do it when I can. Used to build ground planes for UHF and VHF out of ordinary hard drawn wire and SO-239's. As I mentioned previously, I have heard the satellites just by using the OEM duck on my walkie. A mag mount sitting on a metal shelf works, just about anything will work. It's always best to have as much capture area as possible, because doppler effect will cause signal losses when a null is rotated through. And one antenna placed out in the open with a clear sky view will do the trick.