I have seen a commercial setup in a hotel electrical room that have 40+ receivers mounted in racks with cables connected to switches and amplifiers. Each receiver is labeled with the channel it is on, CNN, Cartoon Network, MTV, etc. The hotels tv's have CNN on channel a, Cartoon Network on channel b, MTV on channel c, and so on. All the receivers were sd. I did not see the dish(s) the receivers were connected to. The local and sub-channels were ota. This is a new type of diy (don't install yourself). This is a set up where a highly trained install tech is required.