My Pontiac came equipped with an XM satellite antenna. I prefer Sirius but the pre-installed XM seems to interfere with my signal. Has anyone found an easy way around this?
I think technically Sirius and XM merged although Sirius does seem to be the Alpha dog in the merger, but at any rate you can subscribe to XM and for a few dollars more a month and get "The best of Sirius on XM". Then you wouldn't have to add any extra hardware and have a cleaner more integrated solution. I have XM and am very happy with it, I have not added the Best of Sirius as there didn't seem to be that much extra that interested me.
There should be an XM receiver in the car seperate from the head unit, could be in the trunk or else where, that could probably be disconnected. I don't know if doing that would effect your On-Star if you have that. Good Luck!