The history of radio in Indonesia spans from the Dutch colonial era through the Japanese occupation, eventually becoming a medium for national unity following independence. The following is a summary of key milestones in the history of radio in Indonesia: • Bataviasche Radio Vereeniging (BRV) (June 16, 1925): The first radio broadcasting station in the Dutch East Indies, established in Batavia (Jakarta) and broadcasting in Dutch. • Radio Malabar (1917): Established in Bandung Regency, West Java, this wireless telegraphy station pioneered long-distance communication between Indonesia and the Netherlands and was one of the largest transmitters of its time. • Solosche Radio Vereeniging (SRV) (April 1, 1933): Founded by KGPAA Sri Mangkoenegoro VII and Ir. Sarsito Mangunkusumo in the city of Solo. It was the first radio station owned by indigenous Indonesians, broadcasting local culture, gamelan music, and *wayang* (shadow puppetry). April 1 is now commemorated as National Broadcasting Day (Harsiarnas). • PPRK (March 29, 1937): The *Perkumpulan Radio Ketimuran* (Eastern Radio Association) was formed to facilitate cooperation among indigenous-owned radio associations. • Japanese Occupation Era (1942–1945): Japan dissolved private radio stations and consolidated them under a single war-propaganda command known as *Hoso Kanri Kyoku* (or *Hosokyoku*). *Hosokyoku* broadcasts ceased on August 19, 1945, two days after the Proclamation of Independence was broadcast. • Radio Republik Indonesia (RRI) (September 11, 1945): Established by former *Hosokyoku* staff, with Dr. Abdulrahman Saleh serving as the first Director General. RRI adopted the motto "Once on Air, Always on Air," and its founding date is commemorated as National Radio Day. • New Order Era & Commercial Radio (1970): Through Government Regulation No. 55 of 1970, the government officially legalized the existence of commercial private radio broadcasting in Indonesia. • ​​Amateur Radio Organization of Indonesia (ORARI) (July 9, 1968): Established to regulate and provide a unified body for amateur radio transmitter users across the country. Would you like to know more about specific historical aspects, such as the role of radio during the 1945 Proclamation, guerrilla radio during the revolution, or the evolution of radio in the digital era?