GMA Network, Inc.
It operates a network of 47 Very High Frequency (VHF) stations, including 32 Ultra High Frequency (UHF) television stations and 21 radio stations throughout the country.The Network was founded by Robert La Rue Stewart in 1950 as Republic Broadcasting System (RBS) with flagship AM radio station DZBB operating from the Calvo Building in Escolta, Manila.RBS ventured into television in 1961 and began broadcasting on Channel 7 in the Greater Manila Area. In 1975, the triumvirate of Felipe L. Gozon, Menardo R. Jimenez and Gilberto M. Duavit took over management of RBS from the Stewarts and renamed it GMA 7.