Originally signed on the air on July 29, 1956 as WCKT, channel 7 was a primary NBC affiliate owned by the Biscayne Television Corporation, a partnership between the Cox and Knight publishing families.
A new company called Sunbeam Television, a partnership between Miami Beach-based father-son duo real estate developer Sydney and Edmund Ansin, purchased the station for $3.4 million on December 19, 1962.
This "Circle 7" (a similar, but not the same design as the ABC 7 logo) has been used by the station since, surviving both a callsign and a network affiliation change.
On June 7, 1983, WCKT changed its callsign to the current WSVN, and added a new wordmark to go with this change.
Six years later, on January 1, 1989, at exactly 3:00 am, WSVN, WCIX (now known as WFOR-TV), and WTVJ switched affiliations. WSVN's NBC affiliation moved to WTVJ, channel 4's CBS affiliation moved to WCIX, and channel 6's Fox affiliation moved to channel 7.