Installing satelite radio in 04 cts

I currently use the fm modulator to play sirius satellite radio in my 04 cts. however there is a ton of interferance at times no matter what station i tune it in to. I want to hard wire it in via a pair of rca jacks as you would with your home stereo. my cts radio has a source selector so it must be set up for another source....does anyone know where they are located and how to get to the input rca jacks. my radio has a 1 disc in dash cd player........thanks

Not sure if you have Bose or not but I know Terk makes a Sirius unit that integrates to the factory radio giving you a direct connection, function and sound from your stock radio. If you are tied to the portable and don't want to change to that unit, there are external RF adapters that are stronger than the ones built into the portable units. Hope that helps