We are fulltime RV'ers and have HD TV's in our trailer. We want to upgrade to HD service with one of the dual tuners, probably the 622. It will be put in the living room entertainment center. We have a distribution box that sends a signal to the bedroom TV also. It is only 1 cable. Will this work with the 622 to send another channel to the bedroom? We have 2 cables coming in from the satellite dish now and are using a DVR with no problem with regular programming. Right now we get the same channel in the bedroom. Thanks.