Do the CM troubleshooting first, especially the voltage measurements. Be careful not to short the center conductor to the shield when making the measurements.
Next try an attenuator between the antenna and the preamp input. One or two splitters can be used for an attenuator. A 2-way splitter has a loss of 3.5 dB; a 4-way is 7 dB.
https://www.antennasdirect.com/store...ttenuator.html
http://www.3starinc.com/drop_in-line_attenuator.html
http://mjsales.net/collections/atten...ant=1083705673
•Attenuation values 1, 3, 6, 8, 10, 12, 16, 20dB (FAM)
click on 1 dB for other values; the up and down arrows are faint
The AD Juice or CM7778 would be a better choice than the WG LNA200.
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Do these sound like symptoms for possible overloading or install/product problems?
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Could be any one of them; you must eliminate each possibility.
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should the Channel Master be working?
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Yes, it should be working, that's what you paid for, but could be defective.
Another possibility is electrical interference. It is strongest on VHF-low and your antenna covers that band.
You can test that theory by inserting a UVSJ (high and common ports) between the antenna and the input of the preamp. This will allow only UHF signals into the preamp.
It is possible to measure interference, but you would need a spectrum analyzer or a signal level meter which is why I have suggested inexpensive tests.
Your tvfool report was only resolved to street level. A more accurate report should be done with exact address or coordinates, which will not show in the report. We have found that 2Edge reports can be way off, and when you are on the fringe, the coverage is very spotty. A small change in location can make a big difference in signal strength; much stronger or much weaker.
Use the interactive map browser and move the indicator to your antenna location.
http://www.tvfool.com/index.php?opti...pper&Itemid=90