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Are you saying that you leave the CM7777 on the mast without power? That will block all signal from the antenna. If you are seeing anything, it's likely from the cable downstream of the amp acting as a very poor antenna.
With that antenna, you should get something like 8 or 9 real channels and a few more virtual channels for each real channel. I'd get a new commercially made cable and run it directly from the antenna to the TV and see what I got.
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