OK - Time for some easy R&D. Here's my suggestion. Buy the aftermarket XM antenna of your choice. It must be the single lead pink connector type. If you look at the antenna plug on the XM Receiver, you will notice it has 2 "locating tabs" whereas the antenna's connector only has a slot for one. All you need to do is take a pocket knife and cafefully "shave off" the one offending tab from the receiver's plug. Be sure you remove the correct tab! The other tab will line up correctly and locate the connector. Just go slow and careful, shaving off a little plastic at a time, and you should not have a problem.
There is no guarantee that the aftermarket antenna will work, but I can't imagine why it wouldn't. Also, this connector mod won't keep the factory connector from working anyway.
I bet you will be enjoying XM Radio soon!
