The Portal of the Antique Radios, is famous in Brazil, about antique Radios and Radio Transmissions.
In this site, many Radio Frequencies, measures, DX, in Portoguese.
Sarmento Campos have one of the most important DX and Short Wave and Amateur Radio Sites.
Era do Rádio Site
Valvolandia is one of more antique vendor of Electronic Tubes in São Paulo, Brasil
The International Short-Wave League
Frequencies for receive shortwave, all the world.
Radiomania, an Amateur Radio and DX site
Radio Explorer a software for Listen all the world. Home Page in Russian, but may translated.
This is the list of all the Medium Wave, AM frequencies of the major Brazilian Cities,
More good links are: Amantes do Rádio ,
KEEP RADIO AMATEUR ALIVE