The term POSTED PROPERTY means any property at each corner of which, at each entrance to which and where the area exceeds one acre or where any dimension exceeds one mile, at intervals of not more than 300 feet along or near the boundaries thereof, three feet above the normal ground level there is a substantial sign of wood, metal or other equally substantial material, the face of which is not less than one square foot in area, upon which in legible letters not less than two inches in height, either black against a white background or white against a black background, appear the words “PRIVATE PROPERTY, NO TRESPASS.”
('86 Code, § 9.84.010) (Ord. 1921, passed  - - )