WTVJ was the only commercial television station in the Miami market until Fort Lauderdale-based WFTL-TV (channel 23) signed on the air on December 24, 1954, operating as an NBC affiliate. However, WFTL had no success whatsoever in competing against WTVJ, in part because television sets were not required to have UHF tuning capability until the All-Channel Receiver Act went into effect in 1964. NBC continued to allow WTVJ to cherry-pick programs broadcast by the network until WCKT (channel 7, now Fox affiliate WSVN) signed on in July 1956 and WFTL went dark (that station's former channel 23 allocation is now occupied by Univision owned-and-operated station WLTV-DT). Channel 4 shared ABC programming with WCKT, by way of an arrangement with the network to allow both stations to cherry-pick programming. Although ABC had a full-time affiliate in WITV (channel 17), due to the aforementioned lack of UHF penetration at that time, this arrangement continued until WPST-TV (channel 10, now WPLG) signed on in August 1957. WTVJ also served as the de facto CBS affiliate for West Palm Beach, until WTVX (channel 34, now a CW affiliate) signed on in 1966.