I realize not many people want both Sirius and XM radio at the same time, but I use both while traveling. For those few people that do, I connected both modules to one antenna, and it works great! Here's how to do it:
1. Purchase the Terk SIR-SP antenna splitter. This splitter has square plastic connector clips on each antenna lead. One of these clips will have to be removed to expose the metal antenna connector. This end will be used in the Sirius module. The other connector (still with the plastic) will fit directly onto the XM antenna jack.
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2. The Sirius antenna will f