The pact stands to greatly boost the radio presence of Fox News, which rolled out its service last year, as it looks to compete with the much more entrenched CBS Radio, a unit of Viacom Inc., and Walt Disney Co.'s ABC Radio.

Under the terms of the five—year deal, which starts next year, as many as 172 of Clear Channel's news and talk stations could eventually carry Fox's radio service, which includes news updates of up to five minutes per hour and syndicated talk shows by some of its cable news personalities, including Alan Colmes.

The Clear Channel partnership will give Fox News's nascent radio unit close to 300 stations, including 37 in the top 40 markets. There are options in the deal that could increase the number of Clear Channel stations affiliated with Fox News over time. Fox News said that if all options are exercised, its service could have more than 500 affiliates by mid—2005.