The heads of the radio-advertising firm bought by Google Inc. a year ago have left the company as the Internet giant faces skepticism about its efforts to sell ads on radio stations. Google confirmed the departures of Chad Steelberg and Ryan Steelberg, brothers who led the radio-ad firm dMarc Broadcasting Inc. and sold it to Google last year for $102 million, plus the potential for $1.1 billion in performance-based payments tied to revenue and ad-inventory targets.

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GOOGLE INC. has been racing to extend its reach on the Internet and in traditional media. Now it needs advertisers to follow. Among those it is wooing is Alan Cohen, chief marketing officer of Gemstar-TV Guide International Inc.

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Google is extending its advertising reach into a new medium with the announcement in January of its agreement to acquire dMarc Broadcasting Inc. The deal, expected to close this quarter, means an initial $102 million in cash for the radio ad platform provider with performance-based payouts to come. But what does Google’s move into radio advertising mean for retailer search marketers?

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Google Inc. plans to begin selling advertising on more than 675 radio stations owned by Clear Channel Communications Inc., in a move designed to add scale to the Internet giant’s offline ad-brokering efforts and boost Clear Channel’s revenue. The arrangement is the latest in a string of media ad sales partnerships Google has unveiled as it pushes beyond selling ads online to doing so for newspapers, radio and television.

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