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Determining Range & Clearance
The Fresnel Zone
3-2 Outdoor Antenna Installation Guide
As shown in Figure 3-1, there are two major variables that
determine the shape of the Fresnel Zone:
• The distance between the antennas (1)
• The minimum clearance required for optimal performance (2).
Figure 3-1 Fresnel Zone
Refer to the following table to determine the minimum clearance
required for your installation as defined by the distance between
the antennas. For more information, refer to
Appendix D -
Calculating Range & Clearance
.
Distance Between Antennas (1) Minimum Clearance Required (2)
kilometers (miles) meters (feet)
2.1 (1.3) 5.8 (19.1)
3.5 (2.2) 7.8 (25.7)
6.5 (4.0) 11.1 (36.5)
9.6 (6.0) 14.4 (47.4)
2844-01-03A
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