PURPOSE: To improve the radio wave reflecting characteristic of a reflector by applying a conductive paint or the like to a part of a reflector peripheral where no radio wave reflecting element exists so as to expand a radio wave area in forming the antenna reflector.

CONSTITUTION: A region where the radio wave reflecting raw material is missing is covered by the electrostatic painting and the coating of a metallic material 7 to expand the ratio wave reflecting face. For example, a conductive paint filled with metallic particles or metallic fibers made of copper, aluminum or nickel is coated as a conductive filler to obtain the conductivity of ≥103∼ 105Scm-1 after drying thereby forming a conductive layer of serveral tens μm is thickness.