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The problem of human exposure to the near field of radiobase antennas is a complex and challenging task. A numerical full-wave solution is highly recommended because of the accuracy needed. Unfortunately, the problem is computationally heavy. In this paper, a parallel finite-difference time-domain tool is proposed for the solution of the addressed problem so that the use of supercomputing platforms is combined with appropriate numerical human phantoms. Results demonstrate the good accuracy of the proposed solution. A detailed discussion is presented on the case of human exposure to real radiobase antennas, as well as on some critical issues concerning safety standards.