First rule of driving a tractor. You have to listen to the music of the machine your pulling.
I know the rythum (spelling) of my baler and can tell if its working right with out looking.
It is also difficult to run a radio loud enough to over come the normal noise level of tractor and machines.
Just forget the whole idea. Concentrate on listening to the machines for a change in behavior.
My oh my you hit the nail on the head. We have a family hay farm in Alabama. I know the instant my shear pin breaks on the fly wheel on my square baler by the thump and then free spin sound. Or the sound of when the baling twine isn't flowing properly or snaps on the round baler. And a list of other things. If I were cranking music I would never hear it. However, there is nothing wrong with listening to music while farming as long as you are aware that your senses are slightly diminished and distracted. The most important thing ever is being able to listen to the machinery behind you when that PTO is spinning and muscling about. Lots of disaster can be prevented by being aware of the sounds.
I know the OP is using his "advanced four wheeler" but we lost a neighbor once. He was just four wheeling about and when he was having fun and lifted the bucket on his front end loader it was not pinned down and it slid right down the loader arms and smashes his skull flat as a pancake. So anything can happen. Having your senses dulled makes chances of getting hurt even higher. I understand where K9YLI is coming from. So from a safety standpoint, regardless of 1 year or 100 years of driving farm equipment, is that they should never be regarded as a toy or a pickup truck cruising down the highway. These machines will literally keep chugging, spinning, turning the bush hog blades, extending hydraulic pistons, etc... after you have just rolled the thing over. And all it takes is a mistake, not paying attention, a distraction, etc... and your life is either over or you are seriously injured.
But you didn't ask for any of that. But there are other people that read these threads and it might help someone else whom didn't think of this stuff. Remember that just because you post a question, doesn't mean you are the only one that will ever read it. I have learned numerous things from reading other threads that were years old and I had nothing to do with.
My father before he passed away used to use a set of headphones that had an AM/FM radio built in with a cool rubber ducky antenna coming off of them. Very 1980's design or was it 90s?
I am unsure of anything other than a dedicated RX or HF radio that can receive AM broadcast bands? After all they are in the medium and longwave portion typically i.e. 600 and 2200meters. Not sure what AM radio you speak of that would use a VHF/UHF radio to tune into? So maybe any inexpensive rugged older model HF radio should work just fine. Just plug your headphones into the speaker and jack and jam away to your talk radio shows or evangelical hell and brim-fire screaming preacher than dominates ShortWave.