I have successfully used a neck
loop which I bought on Amazon. It uses the loop technology to connect the FM to the telecoil in your hearing aid (if you have one). Just plug the FM radio to the neck loop, then turn on your telecoil program.
Regarding the neckloops–I’ve personally tried the Williams Sound neckloop and noticed I got better reception when the black triangular part was pulled up a couple inches closer to my neck.
I have not tried the neckloops from Bellman & Symfon or Listen Technologies, but the Bellman one seems to have better online reviews than the other 2.