We're on Dishnet and own 1 Plasma 1080 set. We are about to purchase 2 LCD 720/1080 HDTVs and need to know if we need special receivers. Our older sets work just fine on the infared Dishnet system we own and they are in a storage room. Dishnet says we need receivers at each TV location for HDTV. Our satelite was upgraded to handle HDTV.