Thanks for the test results and the interesting wide-view photos.
Did you insert a UVSJ for Test No. 1 in post #8?
If you use the UVSJ for that test, you don't need to disconnect the VHF section of the Stacker because the UVSJ attenuates VHF and FM.
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1) Is there a good explanation on why raising the antenna would hurt reception? (I thought KTMF was LOS, for which higher is better)
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The signal wavefront is non-uniform and has layers of weak and strong areas. One possibility is roof reflections of the signal that add to the direct signal that enhance it if they arrive at the antenna in phase.
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2) What is the likely hood I can pickup signal at my existing mast location by playing with antenna/pre-amp choices?
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Another location sounds better; sometimes the best location for the signal isn't the most convenient. But don't give up on the present location until you have completed all the options suggested by Mike.