tailgater and rooftop satellite switching

Thanks for the responses. I considered an AB switch but think there must be something that would not require any action on our part. AB switch would be ideal if we were switching between two active Sat inputs. In our application only one Sat would be sending signal to the Sat receiver at any given time. I am looking for something passive, does not require manual switching and will send the active signal down a single coax to the SAT receiver.

bruce