D'oh! Once again, I am late in posting my response to GreyDuck's PPF.
PAST:How amazing! A little box with a telescoping bit of metal and two knobs, out of which comes a variety of noises! What's the earliest experience with radio you can remember?
I had a stuffed animal (a doggie) with an AM radio embedded in its belly.
PRESENT:If you listen to anything on the dial at all nowadays, what does it tend to be?
The 80s radio station or alternative. Sports radio during football and hockey seasons. Radio is so incredibly homogenous now, it's like Mal-Wart: no real variety.
FUTURE: In a dystopian (or utopian) future where nobody really listens to radio anymore and the big corporations have all left the game, you're given control of a big antenna on a hill somewhere to do with as you please. How will you choose to abuse the airwaves?
New wave 80s to irritate the masses; followed by swing, ska, big bands; and some late night pumpkin cake music to help everyone sleep better.