Had 2 cables coming from a dual LNB connected to 2 receivers separately, and the reception in both TVs/receivers were excellent. Then got a new receiver and hooked up all via a 3x4 multi-switch. When 2 TVs are on in different rooms, the signal to one receiver is lost until the other TV is turned off. Was told this setup, a dual LNB with multi-switch hookup, works for up to 4 receivers. Thank you.