My 300 uses Sirius tech, and when I first got it, the dropouts just driving around town made it just about useless. Every bridge I drove under caused a dropout. Any obstruction nearby, such as a dense forest, caused a dropout. But now, that almost never happens. I can even listen to the radio in my 6-level parking garage at work, except in the deepest ground-level at the very back (which is basically underground). I think they added a lot of terrestrial repeaters in the Washington DC area. The only other barely plausible explanation is that Chrysler fixed a bug in my radio. But I doubt it.