I'm very aware a scanner will do this. If that was what I was looking for, I would have just purchased him one.
But I'm very specifically not looking for a scanner. Not looking for new scanner, not looking for a used scanner.
Trying to get outside the box here, guys...
Kinda confused by this. Anything you get, from shortwave radio, to scanner, to airband radio, is going to have to be "programmed" to an extent. At the least, you will have to enter the frequency. There really isn't anything decent, to my knowledge, that you just turn on and use. Those Ramsey radios supposedly do it, and there are some very cheap Chinese knockoffs, but how does it decide what you listen to?