I understand that you want to know if the Slingbox will allow you to get the US TV signal in Brazil.
The Slingbox will work for you as long as you set it up in a US-based home network that meets the requirements. You must also keep in mind that you must meet some other requirements when at remote locations. Having said that, I encourage you to check the following links in order to know the requirements for the Slingbox SOLO and the Slingbox PRO-HD:
Hope this helps.