Just to add, in the good old days, before DTV (which was most of my life), multi-path would make for ghost images on the screen. Weak, noisy signals were snowy. Where I grew up, it was both, as a ridge blocked the LOS to signals from NYC. But TV was watchable, albeit a bit ghosty and snowy. Worse when an airplane went overhead.
My parents' house now can't receive any signals from NYC, as they're too weak and too diffracted and too noisy for the digital tuner to handle. Basic cable is what they have, and it's the best reception they've ever had in the 53 years they've been in that house.
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