Interesting to note that XM has geosynchronous satellites...while Sirius uses...
Quote:
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Unlike XM, Sirius does not use GEO satellites. Instead, its three SS/L-1300 satellites form an inclined elliptical satellite constellation. Sirius says the elliptical path of its satellite constellation ensures that each satellite spends about 16 hours a day over the continental United States, with at least one satellite over the country at all times. Sirius completed its three-satellite constellation on November 30, 2000. A fourth satellite will remain on the ground, ready to be launched if any of the three active satellites encounter transmission problems.
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http://electronics.howstuffworks.com...ite-radio3.htm
I have seen an image of the area those satellites cover...and it includes most of North America. Here in rural Southern Alberta...the Sirius signal is very strong.