[4][5] It had been established by American businessman Samuel "Sam" Gaches, president[4] of H. E. Heacock Company,[6][7] one of the largest department store chains in the Pacific region.

[5][8] Aside from Gaches, an all-American staff was also led by Bertrand "Bert" Silen,[5] station manager; and Johnny Harris, program director; both who formerly worked at KZRM.

[5] The station was later improved with transition from English to Filipino[7] while its facilities were modernized and enlarged as its transmitting power later increased from one to ten kilowatts.

[11] At the outbreak of the Japanese invasion of the country during the Second World War, the radio station was separately operated by the resistance group and by the invading forces who later eventually took over it.

[8] With the possible Japanese invasion of Manila, at the end of 1941 Gen. Douglas MacArthur, Commander of the United States Army Forces in the Far East (USAFFE), ordered the destruction of radio equipment to avoid being used by the invaders.

On the other hand, pre-war KZRH Chinese technician (naturalized Filipino, postwar) Simeon Cheng, and American chief engineer, United States Army Capt.

[12] The remaining staff were later killed, joined resistance guerrilla forces, or brought to Bataan and internment camps at the University of Santo Tomas and Los Baños.

[4] On October 14, 1943, it was rebranded PIAM[c] by the Imperial army,[4][12] being operated by the Department of Information through the newly-renamed Philippine Broadcasting Management Bureau,[9] and becoming a tool for the Second Republic's propaganda.

Among those journalists, aside from Guerrero, were former KZND manager Vero Perfecto, Fidela Magpayo, Filipino–American Yay Panlilio, and (future National Artist) Hernando R.

[11] The Elizalde family, through brothers who were managing the Manila Broadcasting Company—its founder Manolo[11] and Joaquin Miguel, acquired KZRH[7][11] and then financed its operations.

[5][6] In the first post-war years, DZRH initiated first local shows sponsored by Philippine Manufacturing Company,[6] which later boosted advertising,[5] one was Kuwentong Kapitbahay—the first Tagalog soap opera.

[14] In 1972, when then-President Ferdinand Marcos declared Martial Law, DZRH was temporarily closed for a few months; it was reopened but only under strict government censorship.

Upon resumption of broadcasts, DZRH (along with sister stations DZMB and DWIZ) gained a new studio complex at North Bay Boulevard, Navotas and San Francisco del Monte, Quezon City.

[5][11] Following the 1986 revolution, commentators in the station rose into prominence, among them Orly Mercado, Jarius Bondoc, Alvin Capino, and Ka Louie Beltran.

[5] During the series of coup attempts against the administration of Corazon Aquino; then news director Rey Langit played a key role in the on-air mediation with rebel soldiers.

"50 Years of Radio") on July 23; ceremonies and events were held at Rizal Memorial Stadium and Araneta Coliseum included parades, games, concerts, as well as outdoor and indoor fireworks displays.

[16] In 1991, radio veteran Joe Taruc joined the station, where he hosted Damdaming Bayan which is now the longest-running public affairs program, as well as a morning newscast.

In October 1991, DZRH once launched a contest with fifty pairs of shoes as a prize to listeners who could correctly predict the date of return of former First Lady Imelda Marcos, whose ban had been lifted by president Corazon Aquino.

DZRH celebrated its Diamond Jubilee on July 15, 2014, at the Manila Hotel with the launching of the coffee-table book and the special commemorative stamp courtesy of PhilPost.

[19] In the interim, DZRH broadcasts from its backup studio in BSA Twin Towers, where the transmitters of its FM counterparts are located, where it played automated music throughout the day.

Regular programming resumed the following day (October 3) at 4 am PHT, with video streaming for the station's social media accounts and simulcast nationwide satellite relay feed restored later; but the audio live streaming and DZRH News Television channel for cable, DTH and regional digital TV remained off air until November 26 only on TV.

On November 11, DZRH moved its studio at Design Center of the Philippines, situated near the MBC Building across Vicente Sotto Street.

In March 2020, DZRH temporarily suspended its regular programming, especially radio dramas and DZRH News Television programs, in line with the enhanced community quarantine imposed by President Rodrigo Duterte due to the COVID-19 pandemic, which replaced them with news updates; radio dramas would again return to the station after a few months of hiatus.

DZRH station manager Rudolph Steve Jularbal stated that the network will file charges against individuals engaged in the punching of their reporter.