I'm trying to figure out how to get OTA HD to my receivers. I have installed an antenna and the signal is strong. I only have one coax going to each receiver. I needed two dishes (the xtra one for local channels). My incoming feeds meet in the attic, in a multi-switch and then go to individual coax to each receiver. I have the anntenna coax extended to near this multi-switch. How do I get both signals to the TV's? Do I diplex the OTA feed into each receiver's coax in the attic? Do I need a diplexer or splitter before each receiver and split out the signal to the "antenna" input and "satelitte" input?