If you want to hook up more receivers than you're your dish can accommodate, you can use a multiswitch to split up the satellite feed without compromising signal quality. Some multiswitches also allow you to add over-the-air broadcasts or cable feeds, and send both signals to each viewing area via a single coax cable. (You'll need a diplexer for each viewing area to split up the signals again.)

Combine a dual LNB output from a dish, and in some cases combine RF signals, and send signals out to multiple satellite receivers.