Jeff Littlejohn, Executive Vice President of Distribution Development, Clear Channel Radio, said, "Our momentum in rolling out HD digital radio, which is ahead of schedule, is an indicator of the companys enthusiasm about the higher-quality listening experience, strengthened by the data services and multicasted programming available only through HD digital radio."
HD digital radio upgrades AM and FM radio stations by adding a digital signal to the existing analog signal. The result allows AM radio to sound like FM, and FM radio to sound CD-quality.
To enjoy these benefits plus additional programs that can be broadcast through a single station via multicasting, the listener must purchase a HD radio receiver.
- Portions From a Clear Channel News Release
(The author wishes to disclose in a separate position he is an employee of Clear Channel.)

