Thanks, Raoul and Jimbo. The box doesn't say Genie on it anywhere, and, if I don't know what SWM stands for, I assume I can't be using it. So you've just simplified this changeover nicely. Thanks for the quick reply.

Going in the opposite direction of many folks: we have one TV, and don't need more. So I'm wondering whether I need a switch/splitter in the circuit. I'm in the process of moving the DirecTV DVR from the living room to our remodeled sitting room. Currently, there are two cables coming down...