Ask your local radio station to incorporate some into their public service mix.
If you're really ambitious, work with the stations in your listening area to do a "radio block."
The Shaken Baby Association did one in Wisconsin: this article describes how.
Radio Stations Shake up Listeners with Shaken-baby Spot
For 50 seconds on more than 240 Wisconsin radio stations listeners heard the screams of a crying baby on Tuesday morning, April 7. It was part of a radio road block to raise awareness and raise funds for the Shaken Baby Association, an organization that works to prevent, detect and treat shaken baby syndrome.
Gary Mueller, creative director for Serve Marketing, which specializes in providing advertising, marketing and counsel services to underserved charitable organizations said, “You can’t escape it, much as you can’t escape taking care of a baby that’s inconsolable.” Mueller did the voice-over for the spot: “No matter how much she cries, no matter how tired you are, no matter how frustrated you get – never, ever shake a baby.”