The history of UHF television broadcasting in the Bay Area began with the sign-on of KSAN, operating on Channel 32, in 1954. KBAY, which was to operate on Channel 20, was intended to be another early UHF station in San Francisco, but it didn't sign on the air until 1968. KSAN had a limited audience because most television sets could only receive UHF with a special converter. Only in markets such as Fresno and Bakersfield, which had only UHF channels, was there any real reason to purchase such a converter in the 1950s.