I have had good reception with my Sirius antennae under the rear glass (not a Lambo ). As long as there is a clear view of the sky it's no problem. Any thing you drive under like trees, tunnels, etc. will block the signal though. Doesn't bother me much because I hate advertising. Just added MP3 which lets me carry my entire music collection in the palm of my hand. Still working toward the Lambo, will take a while yet. Good luck --Dave