The photo is a bit fuzzy... But I have a lot of experience with that type of connector (SMA) from other equipment. What frequently happens is that the pin on the antenna side gets bent, so it slides between the socket and the white plastic, collapsing the socket. If that is the case, with GREAT care you can heat the white plastic with a hair dryer, and extract the pin with the tip of an x-acto knife. Then after the plastic is cool again, you can use a paper clip (or lead extractor from a pentel P205 pencil) to reshape the socket. Be sure the white plastic is cool and hard, or you will push it farther in and it is really shot.
You will also need a new antenna if it is missing the pin.