Ok, so I am about to make the move to HD and I know I have to have the 3 LNB oval dish to do so. I purchased one that has the built in multi-switch. My question is, it has 4 connections, this is going to 4 different receivers, correct? What if I wanted the same channels to display on 2 TV's (using the same receiver) and 3 other receivers for the other rooms? So, 3 receivers, 4 TV's with 2 of them receiving the same channels. And what is the difference with the multiswitches that have the power supply?