Thanks for the help everyone, and useful charts, rabbit. I ended up going with the 7777, and will take the chance of overload. There are just too many good reviews out there for the 7777.
I spoke with Winegard, and they said the LNA-200 wasn't recommended for cable lengths over 100ft, and "it will result in signal loss." I'm really hoping that's the issue. I know the signals come in clearly halfway down the line, then fall off too much after the full 150ft. It does make sense.
We'll see. TBD
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