I've used a converter box with an analog TV & indoor antenna since the transition to digital broadcasting in 2009. I have been receiving 42 channels from 12 different TV stations in my area (each station broadcasts multiple channels of different programming).
About a week ago, there was an abrupt change in my reception of ALL these channels. I now have no signal at all (no matter what time of day) on 24 of the channels that I've always been able to receive with good signal strength. On the other 18 channels that I've always been able to receive with good signal strength, the signal strength now varies between 0% & 15%. (Ironically, now, on the channels that I can still receive, even with a signal strength as low as 5%, the programming has very little disruption, pixelation, stuttering, freezing, or loss of audio/visual display. Previously, such a low signal strength would have resulted in constant freezing, pixelation, or no audio/visual display.)
The cause of this is a mystery so far. It's the same TV, the same converter box, same antenna, & same location as before. I did not change any component or connection. Everything appears to be functional/operational. It appears that something is now blocking or reducing the signal from all 12 of the TV stations that I was previously receiving good signals from.
I've done "trouble-shooting". I've talked to the technical support department at the FCC. I've searched the internet for information & resources relating to the possible causes of this. I've not yet found any answers or resolution for this particular issue. (There are no new structures or known physical/electrical sources of interference in my home or neighborhood.)
This change was extremely abrupt, not gradual. It's as though something was turned on a week ago that blocks or severely reduces all TV signals in my area. Since this started, the problem has been constant rather than variable.
I'm still looking for answers. Does anybody have any insight as to possible causes of these particular issues? Any input would be appreciated.