I currently have 2 coax cables going to my satellite receiver. One obviously carries the Sat signal and the other my OTA. I would like to free up one coax for using ethernet over coax. However, if I use a diplexer and combine the signals I lose some stations that I get running the ota on a separate coax. I am using an amplifier right before the ota signal runs into the diplexer. My question is would I get better signal if I put a second amplifier after the diplexer at the receiver and/or put a pre amp at the antenna?