The problem is that I do not have a 3.5mm input in my car radio. I have to broadcast the satellite radio from the radio to my radio, and when there are others driving down the highway I often get crossover, as I can hear their radio channel and what they are playing. But I do not want to go down the road of replacing my entire car stereo, so I was wondering if anyone here has a suggestion, perhaps using the 12v cigarette port to input the audio or something.
Here is my stock radio. Notice no 3.5mm.

Simple.. get a Sirius tuner. They are like $100 and will velcro anywhere you want it.

Sounds about right. Almost all of them do that.

You mean the sirius tuner, the thing that allows the car stereo to tune to some channel that isn't being broadcast, then have the sirius unit broadcast the to that channel. THats the way it is playing now, but when someone else drives down the road with a sirius radio, I get the cross bleed of their radio on mine. That is the problem that I am trying to fix.

its not a problem, thats how their entry level tuners are. they suck.