Screening: Ground mounted antennas shall be screened as to minimize visibility from public streets and adjoining properties. Screening shall be accomplished by the installation of landscaping and/or fencing or in the form of a wall or structure enclosing the antenna. The species, quantity, size, and spacing of plant materials shall be specified on the site plan. In order to reduce the height of plant materials, soil berms may be used in conjunction with the proposed landscaping. Any walls or structures shall be constructed of plastic, fiberglass, or other approved materials which will not impede the function and operation of the antenna. Any walls or structures shall be constructed to be consistent with the surrounding site characteristics. The requirements of this section shall not impose unreasonable limitations on, or prevent, reception of satellite delivered signals by satellite receiving and receiving/transmitting antennas or to impose costs on the users of such antennas that are excessive in light of the purchase and installation cost of the equipment.