Snapped antenna
 

Hi, I'm a bit stuck with this one. I have a 1988 D reg Nissan Micra. Some git has broken the antenna off, so now I can't receive any radio stations. I unscrewed the old one (one screw next to the antenna) to take a look and see if I could just put another in its place, but it's got 2 wires going into the antenna holder plus a hard black casing that the snapped antenna goes into. Could anyone please suggest the best way to put a new one on, or where I can get a replacement for this old car :) Thanks