SW44 Automatic Multi-Dish Switch - Two Dish Four Receiver Automatic Dish Switch - connect up to four receivers to two dual LNB dishes, or to one DISH 500 dish equipped with two dual LNBs. SW-44-PI Power Inserter is required. 

SW-44PI - Power Inserter

*** For all Microyal switches (esp. SW-21, SW-21X, SW-44,SW-44A and SW-64),
please make sure the connector and the RG6 cable are installed as follows.
The central copper wire of the cable must extend pass the connector by 2m/m
or else there might be signal loss, resulting in "no signal" from the receiver.