second part of question, want to go to satellite radio also, with the stock hu it did have the xm in the radio. question is this, is the atenna (onstar) also the atenna for the satellite radio also, and can i use it for the aftermarket head unit. how can i tell if it was satellite ready if it wasn't. just purchased the car recently so have no idea about satellite radio, is there something in the trunk that would give me some information, i heard someone once say something about the trunk compartment...2006 monte carlo pioneer deh700bt head unit now in

 

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if i put an aftermarket satellite xm in can i use the shark fin antenna i have on top of the car or do i need to use that stupid magnetic attenna that comes with the aftermarket satellite system. if i can is there an adaptor or something i can use to utilize the onstar antenna

 

i think you can use the existing antenna that you have for the xm that is already installed on the car i just do not know how to do it i have never installed that into my car yet. i do not have one of those antennas in my car so i would have to install it for mine, but i think you can use it