Since you're quite familiar with Buenos Aires... can you give any insight into VALE's recent ascent to the top of the Buenos Aires IBOPEs? It seems ROCK & POP and MEGA have been locked in the fight for #1 for the last couple of years, with VALE and LA100 fighting for 3rd. Now VALE has won the last 3 monthlies. Not being intimately familiar with the stations, I was wondering if there were any specific changes that led to this shakeup in the rankings.
http://www.ibope.com.ar/consultas/radio_gba.htm
http://www.ibope.com.ar/consultas/radio_gba.htm