This is the way to go for your expanded 3 or 4 Receiver system.
Has built in SW-44 switch and two dual LNBs so it's strickly a
bolt on installation. No tedious jumper coaxes to make plus
the connectors are all out of the weather making it less likely
to need service. There are four outputs which need to go directly 1 to each receiver. The legacy quad will work with older and newer Dish Network receivers but if you don't have models 301, 501, 508, or 721 you will need the Legacy Type Lnb.. The Dish Pro Quad is made for the receiver models listed above and is recommended for them.