It is important to check regularly for corrosion, loose cable fittings, or if a cable has been compromised . If you are using a splitter, this could also weaken signal strength. Try disconnecting the splitter and running the cable directly into the TV/converter box and run a channel scan.
Read moreAre there any UHF TV channels?
Additionally, in 2019 the US removed channels 38 through 50 for cellular phone service. The US UHF channel map now only includes channels 14 through 36 .
Read more