Update/Correction:
I stated above the trees were east and north of the house. Should have put west and north of the house. That puts the trees between the house and the close towers. These trees are 70+ year old oak trees and there is no option of eliminating them.
I had also mentioned the issue with receiving ABC, CBS and NBC with no antenna connected to the main TV. Turns out this is isolated to this TV only (older Visio). I placed another TV in the exact same position and connected to the same power outlet and was unable to receive any stations without an antenna.
The adjustable attenuator showed up today and I decided to test it with the connection at main TV. Using the Hauppauge tuner signal meter I was able to dial in the proper amount of attenuation to reduce the pixelation on ABC, CBS, and NBC while still being able to receive Fox and CW. I probably didn't have to use the Hauppauge, but it's nice to see a quantitative value when doing something like this. Btw, the PBS stations have not been an issue.
I really appreciate the knowledgeable information and advice. Going OTA has been a challenging, but very interesting project.
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