There are a few components unique to the AM or FM band and it is possible for one to fail wile the other works
Question does your radio have a line in? and does that work?
On my Class A the Am/FM antenna on the roof is.. well .. Not worth much.. My Effective range is close to how far I can throw a snowball. In august (Ok so I joke a bit).
I use an inverter to power my smart phone so I do not get a ground loop issues (lots of nosie) then feed the audio out from the cell to the AUX in on the dash. (See option 2 below if you don't have an aux in but FM works) Point the browser to WTWW.US then hit LISTEN tab and Transmitter 2 (html) and enjoy "The Greatest Hits of All times"
WTWW (We Transmit World Wide) is a shortwave station (5085 KHz) or 3 in Lebanon TN (T2 is 5085) YOu may find the ads a bit strange (I don't stores I shop) but The music is good.. THey have a new Instant Request system too (different tab use a different device or open new tab to use it) Kind of neat.
Option 2: If your FM works but no aux in you can get a small FM Transmitter at most Audio / Best buy Truck stop stores designed specifically to handle that problem.
Oh my car also does Short wave and I can do it in the motor home too.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times