I have the deck that lets me plug the sirius box right into the back of the deck. I can't see what the signal strength is.
Another annoying thing.. and I'm not sure if it's the Sirius or the Deck in the car. 6 times out of 10 I'll go start my car, and it doesn't even load Sirius. I have to open up the glove box, unplug the main plug from the Sirius box and plug it back in. Then it works fine. Gets annoying after a while.