Sign bases and frames: Freestanding signs shall be either housed in a frame, or set onto a base, presenting a solid, attractive, and well-proportioned appearance. The size and shape of the frame or base shall be proportionate to the size and mass of the sign and should be low-profile in design. Pole-type signs are not permitted. Guy wires, angle irons, braces and other support or construction elements shall be screened or hidden from view.