The CM7777 would have to installed on the TV/OTA adapter side of the Winegard power injector inside your RV instead of on the mast as designed. That means it would also be amplifying any induced signal noise of course. It could also over drive the TV/OTA adapter. I have Winegard's SensarPro combined 10 dB amplifier/power injector installed on our Sensar III antenna, and there have been times I've had to dial down the gain on it for the best reception. And as you know, the CM7777's 30 dB gain is not adjustable...