I also caught Radio Nacional de Brasilia tonight, from Brasilia in Brazil. This was on 6180 kHz from 0305-0431 UTC. The signal was fairly strong but there was interference from another station on an adjacent frequency. The station was playing music, mostly Brazilian, with talk in Portuguese and frequent IDs. Received on the Kaito KA-1103 using its built-in telescopic antenna.
I recorded this and have posted the recording to archive.org.