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This letter presents the study of metallic omnidirectional electromagnetic band gap (EBG) antennas with an omnidirectional pattern in the azimuth plane for base station applications. The technique used to solve the matching problem, generally encountered with this type of antenna is also detailed. A cylindrical EBG antenna for HiperLAN2 applications [5.15-5.35] GHz has been designed and its performances are disclosed. Finally, a prototype has been realized and the experimental measurements are compared to the simulated ones.