I'm waiting for a handheld model of the Sirius network (so I can listen to football games). There is already a handheld XM model with an integrated antenna so that you can carry it around with you, or just dock it in your open top without the need for an antenna. If you are going to get one with an antenna, I imagine the best place for the antenna would be on the windshield in the middle next to the top frame. The only other option would be to place it behind the hood near the vent.