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Don't use the pre amp, you're already getting too much signal now.
As close as those stations are an 8 bay may have too much gain. A 4 bay should be plenty.
You should be able to get just about any antenna to work with those signals. If you can't then something else is going on. Could be interference from FM, or high voltage towers in the way, etc.
Look at the cables. Cable and dish installers don't need to be very particular with how they install as they are dealing with a very strong signal and aren't paid on how much cable or how many splitters they piggy back together.
All that sloppy cabling can kill an OTA signal, cause drops, etc.
I've had to re-cable 3 houses because of the messes the cable guy left behind.
PS, if you want to DIY and antenna look up Mclapp's designs. His are WAY better than the link you posted.
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