Your antenna should say on it somewhere on it, amplified or have nothing on it at all. Square shooter says it on the front. Disconnect the diplexer its not needed unless your combining signal from satellite source and antenna. If you have more than 2 recievers they would have had to install an amp or your antenna wouldnt have worked because the switch does not pass power.... thats where the power supply came in, before the switch. if not it is easlily purchased online from a wingard dealer PS-9370 POWER SUPPLY (117 VAC IN/18 VAC OUT) about $21.00. There where only 2 antenna models that should have been being installed the sensar the skinny limo looking one, non-amplified and amped or the square shooter amped and non. Amplified antenna needs power to workps-9370 works for both.
hope that helps
hope that helps