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In this paper, we study a planar horn antenna fed by a rectangular waveguide operating in the fundamental mode. The aim of this work is to enhance gain by periodic stacked subwavelength hole array. We applied several types of holes with different thicknesses of the metal plate and with varied distance between the periodic stacked subwavelength hole array and the antenna. We found a good improvement of gain from 6 to 17.5 dB in some cases. We also showed that the directivity of the antenna is good in the case of transverse resonance.