I am about to purchase Dish 921. When I asked Dish rep if I'll be able to recieve Local channels in HD, he said 'if your local networks broadcast in HD, you'll be able to recieve them in HD without OTA'. is that true ? will I be able to get NBC, FOX, ABC, WB, CBS and all the local channels in HD ? (I know they broadcast in HD in Los Angeles). I keep reading here that people dont get anything but CBS HD and I don't want to spend some money on an expansive reciever and find out that I don't get my Local HD Channels. I live in Los Angeles Area. thanks for any help.