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. South Korea became the third 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.
Important genres of television shows include serial dramas, historical dramas, variety shows, game shows, news programs, and documentaries. All three networks have produced increasingly lavish historical dramas in recent years. Some South Korean television programs are available on satellite and multicultural channels in North America. Korean television dramas have become widely popular in other East Asian, South Asian and Southeast Asian countries, with whole sets of videotapes or DVDs of series available, complete with different language subtitles. Shopping channels have become quite popular in recent years as well, and the models sometimes put on entertaining acts during product pitches. There are many cable operators in South Korea, such as Tbroad, C&M, CMB, and CJ HelloVision. There are approximately 14 million cable TV subscribers nationwide. The cable operator provides TPS to its subscribers.