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A proposal and a study of a planar dipole antenna with a multi-arm parasitic element for WiMAX applications are presented. The design of an antenna with rectangular dipole arms, which enable the reception of a single-band frequency, is presented. Furthermore, a multi-arm parasitic element is embedded to enable the operation of dual bands with a 10 dB return loss. The antenna is calibrated for WiMAX applications, which cover the 2.5-2.7, 3.3-3.8 and 5.15-5.85 GHz frequency bands. Details of the proposed antenna configuration and experimental results are discussed.