Satellite Radio for your Car?

most satalite radios arent that difficult to put in a older vehicle, you just need to get the satalite radio and theres like one wire i think (im not positive) and it runs from your satalite radio to your sterio, then from your sterio to the roof of the vehicle and thats for the antana (its a little black thing you magnetically put on your vehicles roof) and then you plug the satalite radio into your cigerete lighter and thats about it. if you ask radioshack or someone like that, they can tell you the exacts