Originally Posted by Calaveras
.... It could be something in the house is interfering with the signals. In that case an outdoor antenna would help.
Possibly LED lighting? It's been reported in a couple other threads that LED lighting can cause issues with OTA TV. I'd suggest to the OP that when the problem is active to try and find out whats currently turned on in your house and try turning everything you can, off, using the breaker if you have to. If this fixes the problem turn things back on one-by-one and see what causes the interference to return. I really doubt it would be things like incandescent lights but lots of other things are fair game for interfering with an OTA signal. If you had one or for sure if you had a strong local FM station, you might want to try a FM filter, again something that has caused issues with others in the past.
Lastly if you had the room and didn't mind the ~$70 cost you might want to try a larger more directional antenna. I had a similar issue with a very intermittent breakup of several of my local channels, generally one in particular but sometimes others. I tried everything I mentioned and some things like the FM filter helped a little, but then it would come back at times with a vengeance. Finally in desperation I replaced my attic UHF/VHF medium sized antenna, which I had tried pointing in a few different directions but due to the size of the VHF low elements I was unable to move it more than ~10 degrees one way or the other before it hit rafters. It was pointed basically at my towers in the middle of the 10 degree swing and sometimes when I'd move it, it would seem like it fixed things but then at some point it would return. I replaced my UHF/VHF with a large 8 bay bowtie and initially pointed it directly at the towers. All channels came in in the upper 90s for signal strength except one I watch frequently, PBS, it was 0. I tried moving it ~20 degrees away from the towers and it now comes in ~90%. My other channels dropped to the lower 90s to 70s but so far knock on wood, I've not had an occurrence of dropped signal
I guess what I'm trying to get at is if your having issues now, it's probably not going to get better on it's own, you've got to keep trying different things. I did and like I said sometimes things seemed like they got better but eventually I'd experience signal breakups(on multiple devices at various times) but I hope
replacing the antenna was my ticket!
option is to get your antenna out of the attic, various rafters and such can cause havoc with multipath, probably the biggest issue with our current OTA TV standard but personally I wanted to try everything to keep my antenna in the attic, to keep it free of snow, wind and things that could corrode it over time, good luck to the OP and please keep us informed.