From 1962 until 1974 it broadcast on shortwave from Bucharest, Romania in opposition to Portugal's authoritarian Estado Novo regime.
Some in Portugal assumed that the broadcasts came from the remote Portuguese mountain range of Serra da Estrela.
These underground operations were in contrast to the PCP's Rádio Voz da Liberdade, which used the facilities of Radio Algiers and freely admitted this.
The singer, Luísa Basto, was a regular performer, popularising the song Avante Camarada (Forward comrade), which became the anthem of the Portuguese Communist Party.
[2] The station closed in October 1974 after the 25 April 1974 Carnation Revolution, which overthrew the Estado Novo and ended censorship.