Evan Harrison, Clear Channel Radio’s EVP and President of the company’s digital unit, said the applications generate revenues in two major ways. The apps, available on iPhone, Android and BlackBerry, increase a radio station’s overall audience (by an average of 15 percent when combining both apps and online), and the apps create additional opportunities for ads.

SEE ALSO: Clear Channel Releases New BlackBerry App With Verizon’s Help; Android Version Coming Soon

Less substantial are affiliate fees that are generated when a user buys a song or album through the V Cast app store on Verizon Wireless, or through Apple’s iTunes.

Not only is mobile reusing content from 750 of the company’s terrestrial stations, there’s made-for-mobile programming, too. The apps feature a number of celebrity stations, including radio shows hosted by the Eagles and Maroon 5. The app is also currently featuring an exclusive music video Clear Channel (OTCBB: CCMO) created for Alex Lambert, who was voted off American Idol, and subsequently added to the “Dream” house reality show.

The ads don’t appear in the app until a user selects a station. Then, the ad takes over the whole screen. Harrison says users either have the option to click-through or dismiss it. The ads are returning a roughly 3 to 4 percent click-through rate, he added. In the next iPhone version to be released, the application will feature ads from Apple’s own iAd network, which are touted as being engaging and returning good results. Of course, the content also features the typical audio ads you’d hear over the radio.