I had a weak signal since day one on my rig. Asked Thor support (?????) the same question and got a reply that the assembly line puts them wherever it's convenient. I finally took the inside panel in the cabinet that has the antenna/cable switch out and found the first splitter (to front tv / rear) Sure enough the cables were loose. Guess the installers don't know what a 7/16 wrench is.
That fixed the reception on the front tv, but I could only watch the rear or outside tv separately.
In the fall while winterizing, I had the access panel off under the shower looking for the fresh water drains, I spotted the other splitter on the outside wall. I removed one of the outside speakers and sure enough there was the other spiltter with with loose connections!
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