WAQI (710 AM) is a commercial radio station licensed to Miami, Florida, United States, featuring a Spanish-language talk format known as Radio Mambí. Owned by Latino Media Network and formerly operated by Uforia Audio Network, the radio division of TelevisaUnivision, under a transitional agreement, the station broadcasts with 50,000 watts and serves as South Florida's designated primary entry point for the Emergency Alert System, one of three in the state. The studios are located at Univision's Miami headquarters, and the transmitter is located at the intersection of U.S. 41 and Florida State Road 997, near the edge of the Everglades.

WFTL went on the air from Fort Lauderdale in 1939. The local station raised its profile by switching to its present frequency in 1943 and becoming the highest-power station in Florida at the time. It was acquired by George B. Storer in 1944, after a controversial acquisition that resulted in government scrutiny, and moved to Miami the next year. WGBS grew into a 50,000-watt station, and Storer became headquartered in Miami, starting first an FM station and an ill-fated TV station. It generally aired an adult music format after the 1950s. When Storer opted to exit radio at the end of 1978, Jefferson-Pilot Communications purchased its Miami radio properties, converting the low-rated WGBS to a talk format in February 1983.

In 1985, Jefferson-Pilot sold WGBS to buy WNWS (790 AM), then its direct competitor, merging the two stations' programming on the 790 frequency that had a better signal into Broward County. The 710 facility, with its strong signal into Cuba, was then spun off to Cuban-American businessman Amancio Suárez, resulting in the foundation of WAQI Radio Mambí. Known for its hardline anticommunist stance from the start, Mambí has ranked among the most popular Spanish-language stations in South Florida and is also jammed by the Cuban government; however, it has also been criticized for disseminating disinformation, particularly by groups on the left. Sales of Radio Mambí in 1995 and 2022 have attracted attention in political circles.

On January 10, 1939, Tom M. Bryan filed for a construction permit to build a new local radio station to serve Fort Lauderdale on the frequency of 1370 kHz, with 250 watts during the day and 100 at night. The Federal Communications Commission granted Bryan the permit on July 12, 1939, and on December 3, 1939, WFTL made its first broadcasts from studios and a transmitter site on Andrews Avenue. Bryan had brought other pioneering local businesses to Lauderdale prior to building WFTL; these included the city's first ice plant and telephone company. The station upgraded nighttime power to 250 watts in 1940 and moved to 1400 kHz in 1941 with the frequency changes of NARBA.

In February 1941, Bryan filed to sell WFTL to Ralph A. Horton. While there was concern that the association of Horton with a local newspaper, the morning Fort Lauderdale Times, could block the sale, the FCC approved on July 1. Within months of Horton acquiring WFTL, the station joined the Mutual Broadcasting System, becoming the closest Mutual station to Miami, and in October, Horton filed to move to 710 kHz and increase power to 10,000 watts from a new transmitter site west of the city, which the FCC approved on January 6, 1942. At the time, one Miami station (WIOD) broadcast with 5,000 watts, and a second, WQAM, was slated to join it. Materials restrictions associated with the outbreak of World War II slowed work, but by late 1942, the building expansion had been completed, as had the necessary three-tower array. Not only was the station increasing its power to become the largest in Florida, it announced it would set up Miami studios in the Mayfair Theater, quarters originally used by the Miami Conservatory of Music.

The upgrade and new frequency took effect on February 24, 1943, bringing a full-power Mutual signal to Miami.

Two months after activating the 10,000-watt facility and new Miami studios, Horton—later citing his lack of knowledge of the radio business—announced he would sell WFTL to the Fort Industry Company, led by George B. Storer, for $275,000; Storer would move the station on a full-time basis to Miami, where he owned a home in Surfside. The FCC slated the transaction for hearing, during which time it was revealed that Fort Industry was keeping the station afloat while the transaction was pending.

The FCC approved of the sale on February 29, 1944, and work began to move the station's operations to Miami on a full-time basis. However, several legal concerns and even questions before a House committee investigating the FCC were raised over two issues: the fact that the same attorney, Andrew Bennett, worked for both Horton and Storer, and allegations that FCC chairman James Lawrence Fly had accepted a $17.30 gratuity from Storer to pay for a stay at an Atlanta hotel. Fly denied having any influence with regard to the sale of WFTL. John Sirica, serving as counsel to the House committee, declared that there had been a conspiracy by Fly, Storer, Bennett and others to obtain WFTL. An editorial in the Fort Lauderdale Daily News pointed out Horton's admitted lack of expertise, quipping that "he didn't know a kilocycle from a station-break and he admitted it" and noting that Horton had entered into a refinancing contract that was an unauthorized transfer of control. A final statement from the committee, released at the start of 1945, chided Fly for "putting the heat on" to pressure Horton to sell, declared Bennett's actions to be a "double-crossing" of Horton, and found the sale price "entirely too low" in view of WFTL's business prospects.