Good golly; I never realized there was so much to learn about XM radio services!! Many thanks for ALL the info!! It's going to take me a few days to digest the info, but already ordered the XM Onyx unit and a12v outlet from EC. Again, many thanks for the info.
Pearl Hot Rod Yeller is the fastest, gets better mileage, attracts fewer bugs, better looking owners, etc, etc, etc, etc, etc. Must be true; you read it here!!