I would expect the difference would have to do with the carrier
frequency used. That has nothing to do with it being digital.
This seems to be true, at least for one local station here. I can't
receive it (the digital version) now even though I should be close
enough. Perhaps the station is using a lower power transmitter and
will switch to its higher powered one next year. According to
antennaweb.org, it will also be returning to its former channel (7,
digital currently on 10) then.
some OTA digital stations transmit on UHF freqs,and they are susceptible to
shifts in the ionosphere that occur after dark.
try an amplified indoor antenna,or mount a bigger antenna and booster in
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