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> is AM radio frequency useful for anything else?

Emergency broadcasts.

You do see signs saying tune in to XXXX Hz to hear information about road construction, air port traffic, etc.

And do you actually do this? Whenever I do, the station isn’t working.

I do it all the time, never once had a station that didn't work.

Usually it's just a a couple boring boring words on a loop.

Pretty soon this will be...install our app to access the latest road/construction information...

Sorry, I definitely should have mention any other commercial* gains? As in, any possible chance of a not glaringly obvious 3rd party angle?