does the base radios in cobalts have an aux jack in them so u can hook up sirius.

 

your car an 05 or an 06? i quite confident the 05's dont, well thats what my dealer had told me when i got it and ive never bothered to rip it out and check...but the 06's are said to be compatible again not 100% but pretty sure....although dealers have been known to be wrong..the FM transmitor is pretty good sound quality, i dont have sat radio (cant justify listening to the radio enough) but have installed em and the FM is deccent so...thats an option

 

i got an 05 ans siruis radio in mine. i never really checked if it had a spot or not in the back for aux. I just tune my radio to a certain station and do it that way.

ryan