We have a cradle for both our trailer and truck (also 2 seperate antenna's) so that we can move the receiver back and forth. We utilized the aux-jack in our trailer stereo. We use a cassette type connector for the aux on the truck. We also purchased the Rockbox when purchased our system. It can be used on 110v/12v/or 8 D-cell batteries. And yes you will need a subscription for your receiver. We are able to pickup NFL, MLB, and college football games with ours. We love it for travel and camping and would not travel without it!