So if the obstacle is 40 feet tall and the Fresnel zone at that point is 67.53 feet tall, then the antennas will need to be mounted at least 108 feet (40 + 67.53 = 107.53 ) above the ground to have complete clearance. If we are willing to allow the obstruction to encroach up to 40 percent into the Fresnel zone, we need to keep 60 percent of the Fresnel zone clear. So 60 percent of 67.53 feet is 40.52 feet. The absolute minimum height of the antennas will need to be 81 feet (40 + 40.52 = 80.52 ). Later, you will learn that due to the curvature of the earth, you will actually need to raise the antennas even higher to compensate for the earth's bulge.
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