I recently bought a new car and am thinking about mounting a mobile antenna directly on to the roof. i used to run a trunk lip mount on my last car but it wont fit on my new one, and i wanted to move it to the roof for better reception anyways. so my question is, should a recieve only scanner antenna be grounded to the car body? I have a little experiance with Cbs and know about their needing ground plane to Tx, but what about to listen only??????