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How far above the ground and other obstacles the antennas need to be is
determined by the radius of the Fresnel zone. The radius of the Fresnal Zone
depends upon the frequency and distance between the two radios. The
following table provides approximate Fresnel zone radius:
In order to have LOS clearance, the combined antenna height should be equal
to or at least 70% of the radius of the Fresnel zone.
Fresnel Zone Radius:
Range Distance between
antennas
300m
1.6Km
8Km
10Km
15Km
Required Fresnel
Zone radius
Required Fresnel Zone
Radius ( 2.4GHz Radius)
3.06m
7.07m
15.81m
17.68m
21.65m
System Requirements
Fresnel Zone
Required Fresnel Zone
Radius ( 5GHz Radius)
2.12m
4.9m
10.95m
12.25m
15m
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