It's a simple coax cable to the antenna. The only issue is that it's a specific connector on the end that is unlikely to fit an aftermarket XM radio or antenna extension. HOWEVER, there ARE adapters available that other folks have found so you can attach to the car antenna. You'll have to search to find those threads though, I didn't keep any link/bookmarks.So the factory xm antenna on the trunk will work with other xm tuners? I didnt realize that. Would that apply with all tuners? Is it a universal connection?
It's not a difficult job to run a cable from the rear of the car, forward. Really. Holes exist through the waterfall bulkhead and then just thread down along under the sill trim to the BCM area on the passenger side. Probably take 15 mins tops.
UPDATE: OK I did a search. Here is info on an adapter: Looking for picture of XM antenna connector, radio end.
FURTHER UPDATE: As I read that thread, it seems you can just use the existing cable, though you may (or may not) need to trim the plastic shroud first.