Hello to all. First time caller with a quick question. I'm about to purchase an 811 to pick up Dish network's HD package only. I won't be needing the 811's OTA tuner, as my Hitachi 65xwx20B's internal tuner and attic mounted Silver Sensor are a great match for all of my local OTA HD broadcast. I canceled my Directv about a year ago, but left my sat. dish mounted in place on my deck post. Would I be able to aim this (standard) dish to receive the HD package via the 811, or should I replace it with the Dish500? I wasn't sure if the Dishnetwork HD package programming is coming from one sat or multiple sat's. Also, does anyone happen to know the proper coordinates for my area? Upper Marlboro Maryland 20772. Thanks in advance for your help