A Sansa Clip as a constant radio player

Well, I hope the OP’s experience is closer to yours than mine.

Listening right now to the NPR station WYNC, 93.9, with earbuds on maybe a 5’ cord, and it is doing that phasing, whooshing sound.  Even pop monster Z100 has some of that whoosh.

The very cool indie WFMU, 91.1, is a staticky, impossible nightmare.

Columbia University WKCR,  88.9, and WBGO 88.3,  NPR jazz from New Jersey, are both decent with staticky edges.  They’d probably get on my nerves in all-day listening .

All of those come through rich and clear on the car radio.

Compared to listening to music files, this is way degraded. Part of that is no doubt the compression needed for FM, but part of it is also the reception. YMMV.