That’s just a normal TV aerial socket. Take a look for the omnibox that should be on the outside of the house and see if you can trace any wires coming form it. Otherwise you will need a technician’s visit, arrange that by calling the pre-installs team on 0800 052 1734 8AM- 9PM Monday - Friday or 8AM-6PM Saturday and Sunday
Tudor
There are 10 types of people: those who understand binary and those who don't and F people out of 10 who do not understand hexadecimal c1a2a285948293859940d9a49385a2