DirecTV DVR with King Dome - How to use 2 tuners

Sorry, should have been even more clear. The main KD coax is going to the front AV area. The Aux KD coax is already in use going to the bedroom receiver. So both KD outputs are already in use, but not tied like a SWM setup so the bedroom receiver can't see the DVRs recorded shows.

What has to happen is for the main output to be split to hit both tuners. I don't think a common splitter will do the job. And, being essentially transformers, they don't pass DC.