• March 9, 2004

Arbitron is enhancing its RADAR network radio ratings service through an agreement with Pennsylvania-based Mediaguide, a technology-based media and marketing information company that monitors more than 2,300 local market radio and television stations nationwide. On April 1, Arbitron will begin using Mediaguide's broadcast monitoring technology to verify whether the radio commercials that were scheduled to be aired on affiliated stations of RADAR-rated networks were broadcast as indicated on the network commercial clearance reports. Mediaguide's technology provides real-time measurement and reporting of music performance and advertising execution. Adopting the Mediaguide technology will allow Arbitron to nearly double the sample of stations and nearly triple the number of programming hours that RADAR monitors to verify the accuracy of the clearance information provided by the networks.