In 1940, the Worcester Broadcasting Corporation obtained a construction permit for a 250-watt radio station. Its president, Warren Burnham Worcester, was an aircraft designer and engineer from a prominent family in Worcester, Massachusetts. Worcester Broadcasting's station had call sign KFMB named after Worcester's children: the "M" for daughter Mary and "B" for son Burnham. The Federal Communications Commission (FCC) construction permit was for 1420 kHz. By the time the station signed on, all stations on 1420 kHz had moved to 1450 kHz as a result of the North American Regional Broadcasting Agreement.