[jerrymc]

Originally Posted by rabbit73

Welcome, jerrymc

Where is your antenna located?

Those 2 channels are very weak and require a high gain antenna aimed at them. There is also a mountain in the way and your location is pretty much in a dead zone for them.
http://www.tvfool.com/?option=com_wr...ALLTV%26n%3d38
http://www.tvfool.com/?option=com_wr...ALLTV%26n%3d37

If your 7777 is the new 30 dB version, it overloads very easily with strong signals; even with a partial overload it will make it more difficult to receive weak signals.

Cell tower interference is possible to UHF channels. Their transmitters are moving into the frequencies just above TV channel 51. Different carriers use different frequencies.

https://www.google.com/?gws_rd=ssl#q=4G-LTE+Filter
https://en.wikipedia.org/wiki/4G-LTE_filter

frequencies
https://www.google.com/?gws_rd=ssl#q...frequency+band

http://www.wpsantennas.com/cellular-...formation.aspx

more filter info
http://www.avsforum.com/forum/25-hdt...l#post31466817

Filters are now becoming available, and some preamps have one built-in.

You could try one of the external filters to see if it will make a difference in your area.

The best tool to check for cell transmitters just above UHF TV is a spectrum analyzer, but most people don't have one.

Going from 50 to 75 feet doesn't seem to make a lot of difference for your problem channels.

Sorry, it's on my second story roof.
Second pic is view towards Mt. Wilson. LACO (to the left of that peak is 279W)

https://drive.google.com/open?id=0B6...jcyZ1pFY2lRSFk

https://drive.google.com/open?id=0B6...zRWNkxTTUhLSzg

I also have a CM-3410 dist. amp in the attic because I have 5 rooms hooked up and 2 splitters downstream. (I did try omitting the dist. amp, but I did notice some channels began dropping out (pixelating) even without ANY splitters.


I'm using a cheap RCA DTV/PVR to tweak the signals because all of my TVs have crappy signal strength meters...

https://www.walmart.com/ip/RCA-Digit...TSj14d5LWPSNOQ