My house currently has 2 room dish network. I want to include a third room which has a cable outlet in it. I have looked at how the Dish Network man installed the Dish and cables. I notice that there are two cable running from the satellite and into the Wall Outlets in my attic which in turn go into the wall outlets in the rooms. I was wondering if I could use a splitter on one of the two cables running directly from the satellite and hook that signal into a receiver that i bought on Ebay, would it work? Would using a splitter on a cable make the signal too weak? Thank you for your help.