Since the inception of radio, radio commercials have been a popular choice amongst marketers to reach out a wide audience and even in the modern times, radio voice over ads are preferred over other traditional forms of advertising. It is a cost-effective medium and serves the core purpose with a winning edge. You can hit out to demographic-specific regions and locations by choosing a particular radio station.
For example, if you want to advertise about your New York new office, you can air the commercial at New York station to reach out to the local audience.