Argentine television broadcasting began in 1951 with the inaugural of state-owned Channel 7 (since privatized). A technology jealously guarded by U.S. broadcasters at the time, this was largely the achievement of Jewish-Argentine engineer and radio pioneer Jaime Yankelevich. Color television broadcasting, however, was not widely available until after 1978, when the government launched Argentina Televisora Color (ATC), now Channel 7 (Argentina's principal public television station). The prevalence of cable television, increasing steadily since the first CATV transmitter opened in the city of Junín in 1965, is now the third-widest in the world, reaching at least 78% of households.