KEY TV System Cougar 315RLS

[Apalinto]

Greetings to the group. Our 5th wheel has the Keystone exclusive KEY TV system which I believe is a Home-run wiring system with incorporated antenna booster. For this post, I am having the same issue with both "Over the Air" Antenna and "Park Cable" feeds. TV in the living room and bedroom work excellent, but when a TV is hooked up the the basement TV outlet the signal is extremely weak and grainy, almost to the point where you can't make out what's on the screen. I have tried this using both the bedroom TV and a third TV I own for camping with the same result. For test purposes, I ran a coax cable from the "Park Cable" directly to the third TV and the signal was excellent, so the problem is in the wiring of the trailer. Has anyone in the group experienced this before? I prefer to handle this on my own if you know what I mean. Not super confident with my dealer touching my wires.