Google announced the shut down of its radio-advertising business and cut as many as 40 jobs, saying the investment didn’t provide enough of a payoff.

Google’s radio ad program helps companies decide where ads would run, on which stations and at what times.

Google has been trying to parlay its success in search advertising to other areas without much success. Last month the company closed down its newspaper ad business. Google bought DMarc in 2006 for $102 million in cash and agreed to pay as much as $1.14 billion depending on performance.

Google will stop selling radio ads by May 31.