I'm considering XM, since my '03 is XM ready. But I'm not sure about the antenna issue. The owners manual reads: 'Your XM Satellite Radio antenna is located on the roof of your vehicle.' There is no antenna on my roof. I have one in the windshield, one in the rear window and the Onstar mast mounted to the rear window. Do I need to get another antenna or what?
Well, I got to the bottom of the XM thing. I thought ALL '03 Bonnevilles were XM ready - but it'* an optional package, that I don't have The 'package' includes a XM ready stereo and XM antenna (3" tall tumor on the roof), which all would cost almost $2000 to get installed in my car. So I'll have to go with an aftermarket Delphi XM or a Sirus - $150 is much easier to handle.