When I bought my truck in April, I had to drive it back from Idaho. I had the Sirius for my trip back. It worked great in ID., WA., and Canada. When I hit the AK border, it died and has been dead since. I called Sirius and asked them what's up, they said that there is NO Sirius service in Alaska nor do they plan to have it anytime soon. They said there's not enough people and with the mountains ranges and land mass, it wouldn't be cost effective to install a bunch of repeaters, etc..., etc... If I were you, I'd get something else!!! My .02
Both Xm and Sirius work down here in Sitka. I used an XM radio in Bristol Bay and it worked great there. I know several people in Cordova that have them, but none that I've used were mobile, just the home setup.