I've got an '06 GT 'Vert and I want to get Sirius hooked up inside. How does SIrius work as far as compatability with out GTs? I would like a unit that does not mess with the wiring in the car, and I would like to be able to transfer it to my beater in the winter. Someone mentioned the Sportster as I really want it for the NFL package. Im just not real familar with how it works. Ive heard people complain about outside antennas that stick to the car and sometimes the signal gets lost, is there any product that tunes in with the exiting radio in the car for a better signal? Any help with what I need for the best signal and what it shoul dcost is appreciated!!