For the first time in our 59 year history, Arbitron is changing the way we define a radio station. In addition to standard (analog) AM and FM radio, HD Radio primary or multicast stations as well as Internet streams of government-licensed stations are eligible for reporting in PPM markets, effective with the July 2008 survey.

Here are two helpful guides to explain our new policies:

• A one-page summary that you can print and post at your desk
• A detailed brochure with a start-to-finish explanation of these policies