Sure it's annoying...it's also one of the most quaint and comforting ( if not humanizing) part about it. The total charm is that you listen to your town in the day and the rest of the land at night...one great big atmospheric "show and tell". The magic of distant listening is the hook and the treat. It's what got me hooked on AM at age 4. Getting stuff we are not expecting to hear, and it doesn't sound logical at first, is what got many of us interested in the physcality of the universe to start with, the electronics concepts, fixing these feeble, broken boxes and making the "sing", measure, save the history of life!
Not to mention help your neighbors and find a place in your world.
That noise is welcome here if not always appreciated.
There are no natural sources of frequency modulation in our universe (although forms of phase modulation are abundant) that I'm aware of.
Steven
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