My 5'vers TV coax was completely wired backwards.
I spent a whole camping day trying to figure it out and got it working, but when I took it in for warranty repairs and asked the dealer to wire it up right...
They wired it back up to factory specs...
In other words...they wired it back up the way it came from the factory...BACKWARDS!
Of course, when I tried it out on the next campout...no cable TV from the park!
Thus...another lost camping day crawling around the basement figuring out what they did and reconfiguring it to make it work.
So I gave the dealer one more crack at it...they had the camper for 10 weeks (when they told me it should only be three weeks for about 15 mostly minor warranty issues)...
and they kept calling me and asking me to describe how I found it miswired...
That was the last time my 5'ver ever saw a dealers lot.
Got the 5'ver back just in time for a trip to the Tucson, AZ rodeo, and when we arrived in Tucson and hooked up the cable...
NO CABLE!
So, up went my King/Jack batwing replacement head antenna (best RV antenna on the planet) and enjoyed the local cuisine of Tucson OTA TV for the week, and when I got home to Denver I spent yet another day in the basement fixing it right...all the way from the cable inlet on the outside to the last splitter (replaced all three cheapie factory splitters with good ones) inside the living room entertainment center.
And it has worked flawless ever since!
Footnote:
My previous TT, which I also bought brand new just 2 1/2 years earlier, had the same issue...
The coax was wired completely backwards...and I spent days fixing it myself as that dealer had no clue how to fix it, either.
Gave them two cracks at it to fix...and the third time (me fixing it myself) was the charm!