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The feasibility of simulating the human head instead of simulating the whole body in studying the interaction between antennas and the body is investigated. A 3-D shaped homogeneous human body model is simulated. Several antenna configurations are considered. The interaction between each antenna and the human body is studied. In all cases, antennas are located close to the human head. The performance of each antenna is numerically computed using a general purpose electromagnetic simulator. First, the antenna performance is calculated while the whole human body is simulated. Then the antenna performance is recalculated while the head only or the head and shoulder are simulated. It is found that in cases of high surface current density antennas, the whole human body has to be simulated and it is not enough to simulate the head only or even the head and shoulder. Since the boarders between low current density and high current density antennas are not well defined, the whole human body should always be simulated in studying the interaction between any antenna and the human body.