You can use diplexers that are available through Radio Shack stores to merge the cable and satellite signals for the four receivers. If your multiplexer has an antenna input on it already, then you will only need four diplexers at each reciever. If not you will need eight diplexers, one at each receiver and then one at each of the four outputs on the multiplexer. As far as the antenna signal to the one receiver, you will need a second line for that. I hope this is of some help.