XM, being based off Geostationary satellites (Rock, Roll, and Rhythm) won't cover Alaska unless you use a high gain type parabolic antenna. (A Yagi would work too, as would a Quadfilar Helix properly phased and tuned)
Yes, you can get signal, but it won't be of use to a mobile user using the little antenna.
Sirius uses inclined elliptical orbits with multiple satellites (They make a figure 8 ground track), and actually advertise their service for Canada, so you shouldn't have a problem with their service in the GWN.
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