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You are so close to the transmitter towers, at less than 3 miles away. (My closest station is 15 miles, and others as far as 45.) Those close signals will come in nice and strong as is. If you amplify them, they will bleed over into other channels and cause issues. If you look at your chart, you will see a column for Real Channel. That's the actual channel they broadcast on. I see one is 34 and another is 35, which is a perfect case. When you over amp those two, they will step on each other since they are right next to one another on the frequency scale. The downside is that you get random pixelation and such, degrading a really solid signal. More isn't always better! The only time you need an amp in the mix is to boost the gain of a weak/distant signal.
I've learned a bit over the years, but I'm still a newbie in terms of radio frequency. But it is interesting stuff that we just come to take for granted so often. But the more you know, the better you can make your own install!
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