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Note the path of WAXN's main ch. 50 broadcast: 2-edge. This means that the signal has to scatter over two obstacles to get to you. Click on that listing in the table of your report, and you'll see what I mean (transmitter's on the left, you're on the far right at the bottom.) While propagation via direct line of site is reasonable stable, each scatter adds some variance to the predicted receive strength. Additionally, atmospheric effects will occasionally enhance the bending of signals beyond the horizon. That's why you'll see ch. 50 only sporadically.
The only sure-fire way to improve the situation is more antenna gain or a higher mounting position. More amplification won't help.
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