So I've got a very old stereo and I want to play FM radio on it. Easy it's got the right bandwidth on it and i can pick up all the common stations but the quality of reception is just rubbish - if i hold my left hand in the air with the aerial and touch the window with my right hand it works but when i let go - all i get is static all over again. no issue with where i am, the car gets radio fine.
A second option, these old things usually had a 300ohm ribbon twin cable connected with two screws into the back of the unit. If no ribbon was available then any old two wires connected to those two screws and taken to the top of the wall then spread out away from each other in a 'T' usually did the trick.
Pretty sure I have seen just a wire plugged into the middle bit of that sort of plug work ok. Have you tried that?
Edit: just checked the back of my marantz tuner and it has a TV aerial sort of connector (belling). Its a 'male' prong in the center. The supplied FM aerial is a little wire that just slips over that male prong. The wire is probably 1m long. Seems to work OK.
Nothing is impossible for the man who doesn't have to do it himself - A. H. Weiler