Within the Airfield Zone District, the height of structures, buildings, trees or fences shall not exceed the limits as herein defined and shown on the zone maps for:

A. Approach surface: defined by an inclined plane with a slope of 50:1, 40:1, or 20:1 as shown on the zone maps.

B. Horizontal surface: defined by a horizontal surface located one hundred and fifty (150) feet above the established airport elevation and radiating out from the airport as shown on the zone maps.

C. Conical surface: extends upward from the periphery of the Horizontal Surface (defined in subsection B above) at a slope of 20:1 and outward a distance shown on the zone maps.

D. Transitional surface: extends upward from lines parallel to the center line of the runway at an angle of 7:1 a distance shown on the zone maps.