The Radio Advertising Bureau (RAB) has released its report on Q2 revenue for radio, with growth in all categories of radio for the quarter. Overall revenue was up by one percent from Q2 2011 to $4.36 billion. Spot revenue also grew by one percent to $3.76 billion in Q2, while digital revenue was up three percent to $191 million. Off-air revenue grew by four percent to $409 million.

Looking at the first half of 2012, overall revenue is up by one percent compared to the first six months of 2011, adding up to $7.892 billion. Spot revenue is flat at just over $6.8 billion. Digital revenue is up seven percent to $356 million and off-air revenue is up four percent to $729 million.

"Advertisers continue to maximize Radio's value within their mix with creative use of the medium's various offerings - be they on-air, online or on the go," stated Erica Farber, RAB President/CEO. "Today's listeners are engaging and interacting with Radio across all platforms."

A number of advertiser categories significantly increased their spending in Q2. Automotive was the leading category, up 17 percent and ahead of second place Communications. Rounding out Radio's Top 5 categories are Restaurants, Television/Networks/Cable Providers, and Beverages. Political advertisers also helped the bottom line in this key election year. Within the Miller Kaplan X Ray markets, political accounted for $15.2 million for Q2 2012 and $22.5 million year-to-date through the first six months of the year.