Many pictures of the 100 hectare CEU-Centro Emissor Ultramarino, innaugurated in 1953. Later (after the April, 1974, coup détat)is was pathetically renamed CEOC-Centro Emissor de Ondas Curtas, just like the EN became RDP:
http://www.flickr.com/photos/biblarte/3146550741/in/set-72157611824253132/
Info via dxld