With no feedback, I don't know whether you've solved the problem or not. However I have (I think) worked out where the problem lies:
The elements of TV aerials need to be the right length to 'resonate' with the incoming frequencies. In days gone by it was common practice to use 'grouped' aerials, with each 'group' matching the frequencies used by local transmitters. For example, aerial installers in your area would fit 'Group C/D' aerials onto people's roofs because the transmissions from Winter Hill were in the 'C/D' range of frequencies.
Nowadays though, aerial installers usually put up 'wideband' aerials. (The advantage of 'grouped' aerials is that they're good at picking up weak signals. The advantage of 'wideband' aerials is that it doesn't matter which 'group' the signals are transmitted in; they'll work with any group of frequencies as long as the signal is strong enough).
As I've stated, the Winter Hill transmitter used to broadcast using 'Group C/D' frequencies. However, in order to avoid interference with 5G mobile phone signals, it's been necessary to switch to much lower frequencies. Consequently Winter Hill is now a 'Group T' transmitter. While a 'wideband' aerial should be just as good as picking up those signals as it was before, anyone still with a 'Group C/D' aerial on their roof is now stuck with something that won't be much better at picking up the transmissions than a bent coat hanger would be.
So I strongly suspect that, even though it's worked fine in the past, you've got an aerial which is no longer up to the job.
If you're still able to receive some channels well, it might be worth trying a signal booster, such as one of these
https://www.currys.co.uk/gbuk/tv-and-home-entertainment/tv-accessories/tv-aerials/one-for-all-sv9601-1-way-tv-signal-booster-10135658-pdt.html
(You'll need a fly lead to go with it:
https://www.screwfix.com/p/fly-lead-coaxial-plug-to-plug-1m/41720 )
However if you're hardly able to pick up anything at all, it's time to find a CAI aerial fitter. (DON'T just use any aerial fitter. At least two thirds of the people doing the job are just guys with a ladder and a drill, who know absolutely nothing about how aerials work):
https://www.getmeviewing.org.uk/