Think globally, act locally. Cut the guy wires on their transmitter towers!
One could also think economically and act capitalistically (if that's even an available adverb). Keep track of what advertisers you see in a particular newscast and don't shop with them or use their services.
Even with the drive-by network programs, take a look at the commercials that you see in those shows. Obviously, you won't be using Summer's Eve if you happen to be unfortunate enough to catch "The View" or Viagra if you're watching the old drive-by evening newscasts, but as a simple nota bene, take a look not at the show itself but the advertisers (the "clients" as they are often called).