The idea of converting the former channels 5 and 6 for sound broadcasting use had been first floated in Brazil in 2013, as a method to support AM stations by migrating them to FM; that year, President Dilma Rousseff signed a law that started the AM–FM migration process in Brazil.
Since then, 1,720 of the country's 1,781 AM outlets have requested migration, including in areas where no further FM stations could be added.
[1] Jovem Pan News in São Paulo was allowed by the Ministry of Communications to conduct tests on 84.7 MHz in 2014.
[2] In 2017, a decree was issued that required all new radios produced in the Free Economic Zone of Manaus beginning on January 1, 2019, to support tuning the extended band.
[3] By 2019, some makers of new automobiles, including Ford and Hyundai, and stereo manufacturer Pioneer Corporation were producing radios that supported the new band.