Yes I posted in channels first. I have two access points in my home, I tried turning off the one closest to my antenna but it did not help. I’m open to the idea this is interference but I haven’t pinned down the source yet.

Thank you for the suggestions. This is a passive antenna I have installed in the attic.

There is a wifi access point on the main floor below the antenna. I will unplug it tomorrow and see if it makes a difference.

Details:

HDHomeRun FLEX QUATRO
Hardware Model HDFX-4US
Firmware Version 2025081
Device ID 10B13DC6

Virtual Channel 2.1
Frequency 177.000 MHz
Program Number 3

Problem:

Poor video quality on this station:

Signal Strength 100%
Signal Quality 100%
Symbol Quality 4%

Most channels are fine. This one ...