Quick hits:
You ran your report assuming an antenna height of 10 feet, so mounting at 9 should not be an issue.
All your stations broadcast on UHF (check the real channel column).
You could use a loop antenna at each TV (assuming none are in the basement) OR
Buy an Antennas Direct DB-2 and mount it under the deck. There will be plenty of signal for splitting to multiple TVs.
The measure of signal power available? the noise margins. Even the weakest of your local stations has a margin of 40dB.
Under no circumstances should you buy an amplified antenna.
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