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Please let me know if you think of anything else I should try.
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In post #2 I asked if you had tried a scan for KTMF without a preamp, because of the possibility of partial overload, which affects the weak signals before it affects the strong signals.
Your strongest signal is KUFM with a Noise Margin of 52.7 dB, and a signal power of -38.1 dBm. If you add the antenna gain of say 12 dB, you are at NM 64.7 dB and signal power of -26.1 dB, which might be too much for the LNA200 or the tuner.
Interpreting Noise Margin in the TV Fool Report
http://www.aa6g.org/DTV/Reception/tvfool_nm.html
ADTech hasn't yet done any overload tests for the LNA200, but he did do a test of the LNA100 using an Eclipse antenna and a spectrum analyzer in a strong signal area.
Eclipse antenna, no preamp:
With LNA100 preamp. Notice how the weaker signals are damaged first because of the rising noise floor from IMD (Intermodulation Distortion) products that reduce the SNR of the weak signals:
This is what the signals look like with a high quality preamp that is resistant to overload:
The things you might consider trying:
1. Move the antenna to a location that has a better signal for KTMF
2. Use a preamp that tolerates overload and has a low noise figure to improve the system noise figure as much as possible
3. Elevate the front of the antenna because the signals are coming over a hill
4. Use a separate UHF antenna like a DB8e or 91XG (which has a tilt feature) to replace the UHF section of the Stacker and combine it with the Stacker with a UVSJ.
5. Add an FM trap because you have some strong local FM signals that
might interfere with TV reception. See attachment for FM Fool report for you estimated location.
http://www.mcmelectronics.com/produc...-FM-88-/33-341
http://www.radioshack.com/radioshack...p/1500024.html
I have no idea if any of these ideas will actually improve the reception of KTMF, but the are all I can think of now.