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What direction is the antenna aimed?
Is Mundo Fox carried as another sub-channel on the same real channel?
Do you know the real channel number you're receiving?
Grounding the mast usually requires a long run of wire. The best you can do in many cases is to run as directly as possible from the mast to the main electrical service ground. Avoid sharp bends.
Grounding the coax on the other hand, should be done with a short piece of wire. The coax may need to be run a long distance, but the grounding block should be within a few feet of the main electrical service ground.
Grounding should not reduce the effectiveness of your antenna system, I doubt grounding is the cause of your trouble, if it were, I would think you'd have trouble on many if not all channels.
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