Due to geographical restrictions etc. some areas of the UK are served by small local and relay transmitters.However, what do you mean by "Moel-y-sant does not support commercial programs"?
What is "Moel-y-sant"?
Named 'Freeview Light', these transmitters broadcast a very limited range of 'Public Service Broadcasting' channels i.e. non-commercial (so exclude practically all of the regular Freeview channels!).
'Moel-y-sant' is the name of one of these 'Freeview Light' transmitters.