I tried the built in FM on my S9. It works, but the reception (in my house) left a lot to be desired. So, I ordered a simple FM tiny portable headphone driven receiver that uses 2 AAAs, am listening to it right now. It's quite fantastic (and cheap), in that I hear no static, dropouts and the stereo separation is excellent (which is a problem for every other portable FM device I have ever used). It doesn't have a mono mode, which worried me until to my surprise I realized it wasn't necessary! Seems that all my other FM portables have nasty hiss at least some of the time when not using mono mode. This really is great. Doesn't support MP3s, no AM, but what it does it does great.
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I dug it so much, I bought a 2nd. Cost me $16+tax.
Currently unavailable.
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Edit 5-7-2022: I misplaced one, so bought a 3rd. Then found 2nd, of course. Now I have 3, so one backup (I have 1 and 2 downstairs and upstairs). I love this. Would be better if it supported playing MP3's, a lock switch would be cool, but I haven't found the lack of one a problem so far. Reception is far better than all my other portable FM players and the volume is way adequate. Haven't checked recently on availability but I'm set for now.
Edit a minute later: In stock! At $14.99.