Martin, what I am looking for is an AM/FM portable radio that has built in Bluetooth instead of a headphone jack. That way I can send the audio from the radio directly to the Bluetooth speakers in my helmet. Right now I am doing it with a Bluetooth dongle that plugs into the headphone jack.
It works ok, but battery life is only a couple hours. I would hope that I could find a radio that would send audio to my helmet for a whole day of riding. I like the AM band because it is interesting to listen to the programs of the areas I'm riding through, hearing the news, advertisements, and what the local people are talking about. Small town AM radio, what is left of it, is true Americana.
My dream radio would also have a search function so it would find and lock on stations as I passed through a town without having to manually look for them and a non directional AM antenna like a car radio so the radio wouldn't have to be oriented to receive a station.