Setup an over-the-air TV antenna at my house and the receiver I have will also decode clear QAM. So I hooked it up to my cable modem input to see if there were any stations being sent.
For the most part it was what you'd expect, mostly promotional stations and a couple religious networks.
One of the channels was a login for a Fedora 10 box. Fedora 10. That's a halloween scare for ya.