My reception can vary wildly day to day. Those channels I know can drop out, I check their signal strength before committing to a show. if it is only one bar I see it as likely it will lose signal right in the most interesting part, so I pick another channel.
Some must also realize components in their rv can create enough interference to kill certain channels. I have some VHF channels that instantly disappear with one of my USB phone chargers, and some others with take a hike with my DC to DC laptop converter, and some others if I turn on a LED say goodbye.
Other times the signal just goes away due to atmospheric conditions, and I have found a much larger antenna more precisely pointed, still cannot grab the signal my everyday antenna just lost.
As for crying for the old days of analog snow, no thanks, I'll take more sub channels and digital pixxellation potential anyday.
Some might think the analog singal might still ahve been watcheable when the digital signal at same strength is not. Hard to really say, but all or nothing is OK by me. the pixxellation is a channel changer or a turn the dang thing off result.