Illuminated signs of all types shall be a minimum of 12 feet from the sidewalk to bottom of signs. The maximum extension shall be ten feet from the property line, and not more than two feet within the curbline of the street. All signs in alleys shall be a minimum of 15 feet above driveways. The sign support shall be of steel of sufficient strength to support the sign adequately under all weather conditions. Guys shall be chain or stranded cable.
('69 Code, § 8-18)