yeah would figure sat radio would work the same no matter the provider....unless one has more satellites in the sky
From wikipedia.
"
Prior to July, 2009, there were 7 satellites in orbit; 4 XM and 3 Sirius satellites. Each company also has a ground spare, of identical construction to its first generation of satellite. Also,
International Launch Services launched the newest satellite, Radiosat-5, on July 1, 2009.
[45]
There are no publicly available facts concerning the cross-compatibility of the satellites themselves. If it is possible to use XM satellites to propagate Sirius's signal, this would give Sirius immediate access to a second geostationary satellite, which would improve reception for stationary receivers, such as those at businesses and homes. In the long term, consolidating transponders on to fewer satellites will reduce infrastructure costs significantly: to build and launch one satellite can cost more than US$300 million,
[46] with a lifetime of approximately 15 years. Once the next generation of satellites is constructed and operating, combining satellite networks could result in a savings of US$40 million a year."