No building or structure shall be erected, converted, enlarged, reconstructed or structurally altered to exceed the height limit herein established for the district in which the building is located, except that penthouses or roof structures for the housing of elevators, stairways, tanks, ventilating fans or similar equipment required to operate and maintain the building, and fire or parapet walls, skylights, towers, steeples, flagpoles, chimneys, smokestacks, radio and television aerials or antennas, wireless masts, water tanks, or similar structures may be erected above the height limits herein prescribed. No such structure may be erected to exceed by more than twenty five feet (25') the height limits of the district in which it is located, except that aerials or antennas designed to aid home television reception and shortwave radio may be erected to a height not to exceed sixty feet (60') from the ground level, provided said aerial or antenna is attached to the building or erected in the rear yard area. (Ord. 90-3, 9-12-1990 as amd. 11-5-1990)