There are no cable boxes to buy. If a park has cable, it should work provided you turn off the amplifier for the antenna and if the cable from your outside connection is properly wired. Like others have posted you will most likely need to scan for channels each time you change locations. If it works running a cable directly to the Television and doesn't work hooking up to your outside connection, the problem will either be there is a bad connection in the wiring inside your rig between that outside connection and your television or your amplifier is not turned off.