So we built a lake house and wired three rooms with coax. I need to know the different methods of wiring up receivers and which is the best way. For example my house I have two rooms each with their own coax, both going to the slimline. My brother has some sorta splitter looking thing that you plug into 120v then I think he only has one wire going to his slimline. What are the advantages and what is that splitter called?