I bought one, the KT-200 model coax external.
In general, it gave me about a +3dB increase in SNR, and maybe about a 20% increase in signal strength.
For example, w/o it, my TV would show 60% signal and SNR 16. With KT-200 in-place I got about 80% signal and SNR 19.
One issue I have found with it, is that if you leave it connected and ON all the time, periodically (every 2 months or so), the unit seems to "die." Then I found I had to unplug/turn it off overnight and plug it back in and it seemed to work again...
Go figure..
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