Less than a month into our cord cutting and using a 4tuner dvr with 5tb drive. I did a trial run with an indoor antenna from wally world and was able to get 15 of the 20 available. It seemed to work well enough so I picked up a Mohu sky 60 and installed it... grabs all 20 channels and they all have 5 green dots.
The problem is that i get a lot of random digital pixelation. Bluebloods will be rolling along great and all of a sudden sound drops and the image scatters into digital clutter for a few seconds. It will do this throughout the entire recording. I have not yet really tested to see if it does this in real time ( going to check that today). I know this could be several possible problems and I am posting this in the hopes of a " oh yeah, common problem, easy fix" answer. ; )
Another thing that seems to happen is i will get 4 1 minute recordings of the same episode and no full recording even though another show recording at the same time will do fine.