WBBM, also known on-air as "Newsradio 780", is an all-news CBS radio station in Chicago, Illinois broadcasting on the AM dial @ 780 kHz. It's owned by CBS along with WBBM-TV. The station traces it's history to 1911, when Leslie & Ralph Atlass, owners of the Mallory Battery Company of Lincoln, Illinois began an amateur spark station. In 1923, it received a commercial license & was assigned the frequency of 1300 kHz. It also received it's current call letters, which stand for World's Best Battery Maker. In later years, an alternate meaning, "We Broadcast Better Music", was created.