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If it worked well before then as posted, check or re-do the outside connections and check for signs of water intrusion and corrosion
You should always use "coax-seal" to weather proof outside connections when you are done
It's also possible you now have interference that wasn't there years ago
This could be ANYTHING electronic
I've seen twist and LED bulbs pixel a tv as well as anything that has a microprocessor
So remove the power to anything you want to test to see if it's causing interference
Also those pesky wireless outdoor motion detectors and thermometers can cause OTA interference as well
And something that has appeared EVERYWHERE in the last cople years is 4GLTE cell phones and towers
They use the 700mhz frequencies so they can be amplified by tv antennas and preamps and can overload or desense TV receivers as well
Your cell phone also uses these same frequencies now so it too can cause interference
With all the FCC actions in recent years there are now police and fire radios, and wireless internet transmitters operating inbetween OTA tv channels so they too can be an issue
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