QAntenna has been having some bugs since the change from Qt 4.3 to 4.4. They are all fixed in the trunk, and we are now working for a minor release (0.2.1).
Today I'll try to fix the normals of the radiation patterns, as they are really horrible :-( . The goal is to get the radiation pattern as a smooth surface as it should be.
Update: I have updated the code in the SVN. Normals are not calculated, since we are not using lights (we should, but I didn't have time to do that). Anyway, the problem is solved with a much cleaner code, and now the surfaces look really smooth (as they should from the first time).
Tomorrow Monday I expect to have a new minor release in the streets, and hopefully we will be on time to be on Lenny.