One On One Sports / Sporting News Radio

According to Wikipedia, "One on One Sports was founded in 1991 and delivered closed-circuit broadcasts to spectators attending sporting events such as golf tournaments and auto races, utilizing custom radio receivers. They audio coupled play-by-play commentary with special programming for the listeners at the event. One on One Sports had sports updates every 20 minutes that it called "One on One Sports Flash."
One on One eventually acquired several owned and operated radio stations including WJWR in New York City, WIDB in Chicago, KCTD in Los Angeles and WNRB in Boston.

The Sporting News magazine bought OoOS in 2000 and renamed it Sporting News Radio in 2001.  They later became Yahoo! Sports Radio and will be re-branded once again as SB Nation Radio on August 1st of this year.