"Our advertising on Detroit radio generates 10-12 quality leads from prospective students every week," says Robert Cahill, Director of Communications at Northwestern Technological Institute in Southfield.

"On average," he says, "22% of these leads will close. This is a bigger return than our television advertising delivers."

Since 1979, the school has been training students for careers in the Heating, Ventilation, and Air Conditioning industry. Currently, Northwestern Tech enrolls 650 students per year into its 45 week, program.

"For 35 years, our marketing strategy was to primarily use advertising on daytime television to target unemployed men," says Mr. Cahill. "This approach really helped build the school."

"By 2015, though, our enrollment had dropped by nearly 40%. That's when we knew we had to try a new approach."  The new strategy would include advertising on Detroit radio.