Couple of things.
Our old 100hz wide screen CRT had a hell of a job tuning in. Our signal at home is too clear and we get Wales and Granada. The TV couldn't select region though. It was ok for a time as I could leave the aerial out until a certain position then plug in. That got impossible when The Granada signals moved next to the Welsh ones.
Replaced the TV recently with a new HD Smart TV and took the old TV down to North Wales. Guess what, the old telly picked up Granada but not the Welsh channels at all. It had been picking up channels from over 65 miles away....