If you already have HDTV why to bother about setup box? plug the co-ax cable direclty to your TV u will be able to enjoy all HDTVs. The only thing will be the channels will be absurd like 35.0185 or 37.1125. This however doesn;t apply to premium channels and u won't have cable on demand. If you are fan of cable on demand than u need the box. Otherwise, just plug to your TV and save $10/mo.