where do i get a new aerial socket?

Hi,

I live in a small block of flats, the aerial socket has broken so need to replace it.

When i unscrewed it, there is a cable coming from the flat above attached to the back, and a cable going to the flat below.

Every socket i've found so far only has one clamp for one lead? I beleive its an isolated one as there is a mini ciruit board, but cant seem to find a replacement anywhere,

any help would be great,

T