You said the antenna is on the roof, correct? Is there a clear view to the north, and to the SSE, 136 degrees? Unless you need more height to clear the neighbors house or some other obstacle, you should be OK.
Yes, I would try another TV just to eliminate the possibility of a tuner issue.
Just curious, is there more than one coax connection point on your TV?
Any chance you over torqued the antenna balun when you attached the coax? I assume you're using the balun that came with the U8000. Maybe double check the spade tip connections and coax connection at the antenna. And a stupid question but here goes... The front side of the antenna is the one with the bowties and that's the side you're aiming to the north, correct?
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