Yes, but the
muxes are in groups ... so (from my brief observations) you tend to lose more than one channel at a time, but - happily - not
all channels. But when the antenna is flapping about on the top of an exposed caravan, or when the rain is [censored] down, then the picture cracks up (and often drops out all together), rather than just deteriorating for a while as it would have done previously. So, to answer my own question:- in the situation I am talking about, no ... it is
not an improvement.

My guess is that digital TV technology probably works best for "cable" (CATV).
If I ever felt the need to install TV for my own use (which is very unlikely, I might add), I believe I would go for "satellite" (Sat-TV) just as I did back in the late 1980's.

@Dave: yes, we don't like the idea of wasting
brass up 'ere tha' knows.