Welcome to the forum, Russ:
You don't have many channels available because of the terrain, but based on your test results, your chances are good for the 3 you want.
The 3 channels that you want are all on VHF-High. There aren't many antennas left for that band. The most suitable would be the Antennacraft Y10-7-13, which is in short supply.
http://www.antennacraft.net/pdfs/Y10-7-13.pdf
Summit source had some, but they are gone.
If you also want some UHF channels (real channels 14-51), then you would need a VHF/UHF combo antenna, instead of the Y10-7-13.
There are some VHF/UHF combo antennas available with about the same VHF gain as the Y10-7-13, but they are bigger and more expensive, like the Winegard HD7698P.
http://www.solidsignal.com/pview.asp?p=hd7698p
http://www.amazon.com/Winegard-HD769.../dp/B001DFTGRY
specs
http://www.starkelectronic.com/hd7698p.pdf
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The report is for my house. My neighbor's house is about 200 feet away and 30 feet higher than my house.
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That extra 30 feet seems to make a difference. Maybe you can mount your antenna higher.
Using the short coordinates on your tvfool report, I don't see any strong FM signals that might cause interference to your TV signals. See the attachment.
Yes, you will need a preamp mounted at the antenna, especially with that long coax run. The 150 feet would cause a loss at UHF of about 9 dB, but much less for VHF. I suggest an Antennas Direct Juice or a Channel Master 7777.
https://www.antennasdirect.com/store/JUICE.html
http://www.solidsignal.com/pview.asp?p=cm-7777
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He bought a Winegard HD-7694P antenna.....We're basically looking for advice on antenna selection (he can return the one he bought)
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If possible, it might be interesting to try the 7694 with a preamp before returning it.
http://www.skywalker.com/catalog/Manuals/WIN1051.pdf
RG6 coax comes with a solid copper or copper clad steel center conductor. The signal loss for both is about the same, but the DC voltage loss for the preamp is less with solid copper. I not sure how much difference it would make for 150 feet.
The coax shield should be grounded with a grounding block that is connected to the house electrical system ground with 10 gauge copper wire for electrical safety. For further compliance with the electrical code (NEC), the mast should also be grounded in a similar manner to drain any buildup of static charge, but the system will not survive a direct strike.
Please let us know the results of your tests on this same thread.