In South Korea, there are a number of national television networks, the three largest of which are KBS, MBC, and SBS. Most of the major television studios are located on Yeouido and Sangam-dong, Seoul. South Korea became the fourth adopter in Asia when television broadcasting began on 12 May 1956 with the opening of HLKZ-TV, a commercially operated television station. HLKZ-TV was established by the RCA Distribution Company (KORCAD) in Seoul with 186–192 MHz, 100-watt output, and 525 scanning lines.