The finite size of the ground plane in adaptive par- asitic arrays employing monopole elements affects the radiation pattern, causing a shift of the main lobe from the azimuthal plane of the antenna. This is usually a nondesired behavior. In order to correct this shift, a truncated cone is placed on the top of the ra- diating structure. The cone works as a proper reflector deflecting the main beam and thus producing a pattern with a greater gain on the azimuthal plane.
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