It looks like it's not been fitted properly, looking at the photo undo the screw that secures it then solder a connecting wire between the end where the fixing hole is and the antenna socket then orientate it so that it's pointing upwards (in context of the photo) with the belly of the contact in contact with the foil then put the screw back to secure it.
13th photo:
https://www.pa3esy.nl/Philips/ontvan...bx281_set.html
Lawrence.