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Parasitic structures around a narrowband antenna may lead to significant bandwidth broadening. For instance, staircase metallic rings around a monopole antenna have been successfully used recently, yielding an impedance bandwidth increase by a factor of close to 10. In this letter, a conical metallic skirt is proposed as the parasite instead. The technique has been assessed with the aid of electromagnetic analysis software. A prototype for operation at the 1.5-4.5-GHz band was assembled and measured. The bandwidth increase is around 0.4 GHz greater than the one obtained with parasitic rings.