It's an older VHF/UHF/FM antenna in the attic that is theoretically powered. It may be due for a replacement. Any idea of what I should be looking for?

Well, something interesting happened. Previously, I had 20+ ATSC 3.0 channels detected, and during the initial channel scan it found even more. However, when it finished, I was left with just 7 ATSC channels, and all of them worked. I'm a bit confused why would most of my channels disappear? And why...

Unable to play channel: No Video Data This started happening several months ago, and it would only do it for certain select subchannels. At first I thought it was some sort of encryption, I think that would be a different error message. Is it possible my antenna is not picking up enough signal now ...