I currently have TW cable and am thinking about Dish Network. Here is my problem: I have 2 HD TV's and several non-HD TV's, and I want to have the antenna receive HD signals for the HD TV's and regular signals to the other TV's. Do I bring the wiring to my current cable box or what do I do? I don't have to buy a seperate antenna for each TV, do I?

only need one antenna. You do not have to do anything, the installer will.