Radio Outreaches The Internet Ad Networks Source: comScore Media Metrix, Ad Focus Ranking, Total U.S. (Home, Work, and University Locations), June 2009, and Arbitron, RADAR 101, June 2009, Network Ratings, Persons 12+. ( 235 million listeners each week, TSL 18½ hours ). Each week , Radio reaches more people than any Internet ad network reaches in a month .