First, I apologize. I know this information is out there but to be honest I have information overload at this point. Here is what I have: Currently: HR10-250 2x Satellite straight runs from dish 1x Antenna straight run from attic mount My problem is I am getting a HR20 tomorrow that I want to add into this scenario. I am in a very old house and it has crossbeams in the walls. I currently can't run any more cable through the opening I have. I've heard that MPEG4 can't be added onto a wire with antenna so how would I do this? Can I split 2 sat cables into 4 and then keep the antenna separate? Keep in mind this is just one TV. I want to have both boxes there so the "splitting" would be done right behind the TV and not at the dish. Thanks!