An antenna, designated as the disc-Ys antenna, where a fed disc is located above a finite ground plane and surrounded by parasitic bent Y-shaped elements (Ys), is designed as a beam-steering antenna. The bottom end of each Y-shaped element is either open or short-circuited to the ground plane. The variation in the radiation pattern in the horizontal plane is presented as a function of the number of open Ys. In addition, the beam direction in the elevation plane and the VSWR are analyzed as a function of the vertex angle of the V-shaped section of the Y-shaped element. It is found that the beam direction in the elevation plane is the closest to the horizontal plane when the vertex angle is 180°.