The amount sums an outrageous yearly US$350.000, and the banner is this one:
No, this is not a Internet-wide marketing campaign. It´s a SINGLE BANNER in a not-that-popular website, www.paraiba.com.br, with a meek 208.667 Alexa ranking.
It´s not the first time, last year they aired the banner, too. But charged ONLY US$25.000,00 A MONTH for their trouble.
The entire transaction is online:
Link to the details of the operation - Brazilian Senate Website, translated by Google.
Oh, it´s not the only contract, looks like the R$48.000,00 monthly fee is standard to the Brazilian Senate: http://www.senado.gov.br/sf/contratos/empresaContratada.asp?o=1&e=R%C1DIO+E+TV+PARAIBANA