There has been continental interference to Crystal Palace transmissions during the good weather, you may find this has gone now. It can cause pixelation or loss of picture.I transferred to an indoor antenna to cure the problem, but I have good line of sight to the transmitter, you may find inserting an inline 3dB attenuator may fix the issue. This is easy to fit yourself, you just plug it in the TV and plug the existing aerial plug into it.https://www.amazon.co.uk/Labgear-UHF-Line-Signal-Attenuator/dp/B07G5GM8HB/
Mark Aston ● 1900d