I am a current Dish customer and have been since 2003. I am contemplating a switch over to DTV. I have some questions which my local dealer seems to not be able to answer which is a concern if they were to come out and provide the work. I currently have a Dish 1000.2 I believe which has three feeds being fed into a On-Q module which also accepts an OTA feed. This is a really nice and clean install in my On-Q box as it then only requires one feed per room. The signal is then fed into a diplexer and then into a Dish Pro Plus seperator at the receiver location. I currently have two 722's and one 622 and have really not encountered any major issues lately. My questions are: 1. Can I utilize the exisiting three feeds and the On-Q module to supply the signal to each room or do I need to install a multi-switch with the DTV dish? 2. I am thinking of leasing two HR24's and one HD receiver. Could all three receivers accept an OTA signal with one feed? 3. Can I roof mount the DTV dish? I would greatly appreciate anyone's input.