RTP Africa is beamed to Africa not North America. Sorry.
RTP international is available in AMC4 and they have programing at late night from RTP Africa.
First. RTP Africa is on C Band. That would require a big dish (at least 6 feet +). Second (and I am guessing since I don't have C band), RTP Africa is on a East Hemi beam. East Hemisphere beam doesn't come close to North America since we are in Western hemisphere .
There are 2 beams Estern and western. The weastern one is the only one taht covers the USA but dosen't have RTP on it.
The only transponder that cover the USA is 3732 R 14000
Western beam: