Figure 10: Fresnel Zone - Geokon GeoNet 8800 Series Instruction Manual

reflected signal may act as constructive or destructive interference with the
received signal. For optimum performance, recommends creating as
GEOKON
much vertical space as possible between the straight-line path and obstacles,
including the ground.
The Fresnel zone must be at least 60% obstruction-free to ensure optimal
wireless communication.
The figure below illustrates the Fresnel zone.
10:
Fresnel Zone
By the ground
By road traffic
Radio Paths
Building Tree Building
By an obstacle

FIGURE 10: Fresnel Zone

If communication cannot be established when GeoNet is deployed to a site, it
may be necessary to elevate the devices or their antennas, or to move them to a
location where a radio link can be established. This may require extending the
readout cable of the attached sensors, or connecting an antenna cable
extension.
8 | INTRODUCTION | GEOKON