From Wired comes the story of a radio transmitter that sends out a mysterious series of beeps and other random noise. They are pretty sure that it is a Russian military signal. And that makes sense.
I like the idea of a radio tower sending out a secret message that is widely disseminated over the internet for anyone to hear. That is both secret and well known.
There is another world where I have a radio tower sending out my inner thoughts in a series of blips and clicks. Only I can decipher it. But everyone can hear.