I have just completed installing a Kenwood EZ500 head unit and a Kenwood Sirius receiver in my 2005 Sonata. At first I thought that I could get away wiith mounting the Sirius antenna as far forward on the front dash as I could and obtain good results. I was wrong.. While the reception is excellent in one city, it is horrible in another... all depends on which way the car is heading and the overhead obstructions. My next step is to move the Sirius antenna to the top of the vehicle. Has anyone installed a Sirius system in a Sonata and where did you put the antenna? On the top in front of the sunroof or on just forward of the rear window? Any inputs would be appreciated before I make the move.