Short answers, pulled from the story.
Warren Burnham Worcester began broadcasting KFMB at 8 pm on the 19th of August 1941. The station operated with only 250 watts of power and studios were located at Pacific Highway and Ash Street.
Jack O. Gross bought KFMB for ninety-five thousand dollars alongside partner O.L. Taylor through the trustees of Worcester's estate. Gross later acquired sole ownership on the 12th of June 1945 and launched an FM sister station in April 1947.
KFMB adopted a full service format combining music, news, talk, and sports from 1964 to 1975. Studios relocated to Kearny Mesa in 1977 where they remained for over forty years.
The Federal Communications Commission approved the change because the three-letter designation had been used previously by KLSD from 1928 to 1982. The new call sign became official on the 4th of July 2020 following the transaction that closed on the 17th of March 2020.
KGB broadcasts at 5,000 watts during daytime hours using a non-directional antenna. Nighttime power increases to maximum 50,000 watts with a directional antenna to prevent interference with WJR in Detroit.