Not sure of your set up, my previous TT had the same issue though, turned out I had to go behind the booster plate and take out the manufacturer's splitter which would not let sat signal pass through, and directly wire the outside to the box. In other words, i basically bypassed their splitter, so when i connected the dish outside to the hook up for the cable, it was just like a direct feed to the trailer.
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2012 Ford F-350 6.7L CC SRW w/FX4
2013 Forest River Sierra 365SAQ
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