These days, even radio programs are online. You can get a pretty good overview of what a radio show does if you visit its website or Google it. Just a few seconds on their site will give you all you need to know to make sure you're talking about something relevant to the station’s audience. These days, the Internet is your best friend.
Here are some additional tips for working with radio:
Guests need to be able to speak at length—and illustrate with real examples/props
What works best for TV doesn’t necessarily work for radio. There are a lot of guests on a TV segment and it's moving all the time. “For talk radio, what we do is more about having a guest who can be on topic for an hour. Make sure your source can be available that long and has a real opinion on topical issues," says a senior producer at Fox News Talk. "Realize we need guests who can tell first-person stories about what's happening to real people," she advises.