1. Try it.
2. I'm seeing a lot of folk call this out and in the past such would show up as snow. So when the signal is weak or there's an encoding error by them, it's pixelated as the TV uses what parts of the image it received.
Again, this is something we used to accept as a station faded in and out. But today so many were on cable for so long they forgot the old Over The Air issues.
I have a over the air digital tv where I'm getting pixelation on 2 stations .All the other stations are great. Would an adjustment of the signal strength and noise reduction on my tv remote menu make a difference