Antenna device (1) configured for wireless positioning. The antenna device comprises a ground plane (10) having a polygonal shape comprising at least 4 side edges (11). A plurality of chip antenna elements (20) tuned to a predetermined radio frequency are each singly provided at one of said side edges with a spacing (D) between adjacent ones of said chip antenna elements corresponding to ½ of a wavelength of said predetermined radio frequency. A patch antenna element (30) tuned to said predetermined radio frequency is provided at a center portion of a front side (12) of the ground plane.
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