Just wondering if anyone could tell me the best way to access the OEM radios antenna wire to patch in the Sirius wiring. I think I can handle routing the actual Sirius antenna and power wiring. Is this something I even want to try or should I leave it to a dealer/audio shop? It was pretty easy in my Honda and GMC but the Mercedes looks like more of a pain in the *** to figure out.

Any advice is much appreciated!!