New customer here, I ordered the free HD-DVR along with 4 Standard Receivers. My question is, can I use an HD receiver on a standard def TV? Will it convert to standard def? I want on-demand on another TV. I had selected HD for a few rooms, and noticed there was no extra charge for an HD upgrade for another room or two. I decided to go with the standard receivers because I did not do my research and thought I could get on-demand with a standard receiver similar to cable converter boxes. Can I mail them back a Standard receiver and have send me an HD an no extra charge or am I screwed? Also, is there any other place that will swap them for me or am I stuck with the mail? My service started 8/10. Thanks.