That antenna is primarily for UHF, but will receive VHF-High if the signals are very strong. Does she get Fox, MyN, and ABC on real channels 11. 13, and 7?
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I just was wondering why the signal jumps from 50% to 0% back and forth only on those channels.
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OTA signals constantly vary in strength. Since they are so close to the "Digital Cliff" it doesn't take much change for them to drop out.
https://en.wikipedia.org/wiki/Cliff_effect
A Fade Margin of 10 dB is needed to allow for changes in signal strength, but those signals don't have it.