The Sirius satellite radio on my 300C has a hard time hanging onto a signal when I'm on a regular tree lined street. It's mostly OK on highways, although I've occasionally experienced a dropped signal on a highway also, but it's terrible if there are any trees around. Is this a fact of life with satellite radio or do I have a loose antenna connection? Microwaves are easily blocked, especially by wet leaves, so it's possible that this is normal. Are there any other 300 owners who have Sirius radios, how well does it work for you? BTW I'm in Massachusetts, I don't know where Sirius hangs their satellites but I wouldn't be surprised if they are positioned over the middle of the country which would contribute to the weakness of the signal on the coasts.