The socket is probably snapped off the UHF tuner, as the socket and tuner are generally integrated nowadays. In this case you will usually need a complete new tuner - can be quite expensive. "Guesstimate".. £40-£70 for the part + £40-£50 labour.
If you still have the socket part, an engineer may be able to re-attach it, if it hasn't ripped away the printed circuit inside the tuner.
Cobweb, December 2006
