Advertising signs. Hereafter, notwithstanding any other provisions of this chapter, signs not pertaining to the use, sale, rent or lease of property on the same lot and signs not representing construction or subdivision activity, as allowed, are not permitted in any district, except that signs for the purpose of directing persons to a business or establishment may be erected in any district, provided that such signs shall not exceed four square feet in area per establishment, shall conform with applicable regulations of the district in which they are located, shall be grouped on community poles and shall be approved by the Planning Board.