It should have two holes on at the sides on the face, you have to insert 2 rods to release the clips holding it in and it should slide out, might be a bit stiff. Push it out from behind if you can get your hand in
i think you can get the rods from halfords or somewhere if you dont have anything that is similar, i managed it with a car aerial kit (my own of corse)
Steve, September 2005