Would something like this work for older Dish Network?
Zinwell SAM3402 DIRECTV Approved 3x4 Multiswitch (SAM3402) | SAM3402 [Zinwell] | SAM-3402 3402 3x4 3 x 4 multiplexer
CP Electronics: MULTISWITCH 3x4 DIRECTV - DISH NETWORK 3x4, SWITCHES & SPLITTERS, SAM3402
I want to add a third receiver...