Not sure about Anglesey, but my Mum lives in Colwyn Bay (not far away) and she has to have a special aerial to receive terestial TV as the reception is so bad.
Anglesey is 13 miles from your local transmitter, your postcode will determine the exact distance. Hills and tall buildings will effect reception. The higher the aerial, the better. Which also needs to be high gain.
This info is not guaranteed, just a guide!!
Asda have freeview boxes for £28, and you can return them within 28 days for a no quibble refund. Basically, nothing to loose.
Don't scrimp on cable either. DIY off the reel white cable is no good. It has to be digital cable, preferably CT100 quality.
I have a load of it for 50p a metre plus P&P. Hi grade digital RG59 twin shielded black. Can supply coax/f connectors as well.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets