I have the four receivers in townhouse right now. All d10's. Just got the hr10-250. Have not hooked up the hr10-250 yet. I have 2 of the d10's on my hd tv so I can run split screen. I do not have a OTA antenna with NO possibility of installing one right now. My questions are. 1. If I want to have my hr-250 do dual tuner but also leave one of the d10's so that I can still watch split screen while recording a third show I assume I will need a 5x8 multiswitch because i will be effectively be running 5 receivers. (Two bedrooms, the d10 for the split screen and the 2 for the hr10-250 dvr.) Now will I need diplexers after the multiswitch connections if I have NO ota connections needed. It looks to me that the diagrams I see for the multiswitches have diplexers on them so that you can have the ota antenna and the triple lnb dish with the four lines on the front side. But I do not need to combine the signal with diplexers because I have no ota. Is this correct? I have a headache. Also an unrelated question. If my hr10-250 is using the hdmi do any of the other video outputs work? I do know that you cannot watch split screen from the hr10-250 on its own.