Replace radio with factory cd/xm radio

Was wanting to to know if the cars already have the xm antenna wire built in them if they did not come from the factory with the good radio. Mine is an 09 aveo5 with the six speaker sound system but for some reason it did not come with the good radio just am/fm/mp3 no xm i have found a factory oem for the car with built in xm but dont know if chevrolet puts the antenna in all the cars or not. It does have onstar. and i dont want to try to take the other radio out for no reason.

Thanks in advance.