I just did a dish move and they installed a DP+4:4 switch and 2 tuner separator. I have voom so they also installed a 61.5. I am trying to get OTA channels back over single coaxial. Installer left two diplexers. Should the dixipler go behind or infront of above switch? Have tried both ways and can not get OTA channels. Anyone know where I can get additional information. Diagram etc. I also have the second diplexer behind behind 2 tuner seperator at 921 receiver.