It was interesting to hear radio stations from Argentina, across the mediumwave band on frequencies usually dominated by Brazil, during the April 2007 dxpedition to Jongensgat.
Radio Mitre, Buenos Aires on 790 kHz was one of the stations from that part of the world to make it through with a huge "local quality" signal (audio clip below).
Monica de Carvalho kindly verified my Spanish email report.