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Installation Guidelines
Overview of the Outdoor Installation
Outdoor Antenna Installation Guide 2-11
Antenna Placement 2
To achieve maximum performance for your wireless outdoor
connection, the RoamAbout Outdoor Antennas must have clear
line-of-sight which is defined as:
• No obstacles in the direct path between the two antennas.
• No obstacles within a defined zone around the antenna beam.
The shape of a radio beam is not straight and narrow like a laser
beam. The radio beam, also referred to as Fresnel Zone, is bulged
in the middle, like a football or rugby ball. The exact shape and
width of the Fresnel Zone is determined by the path length and
frequency of the radio signal.
If any significant part of this zone is obstructed, a portion of the
radio energy will be lost, resulting in reduced performance.
Reduced performance may also occur when obstacles that are
close to the antenna beam cause signal reflections or noise that
interfere with the radio signal.
Figure 2-3 shows some typical examples of obstacles that you
must avoid for a directional antenna to operate effectively:
A. Neighboring Buildings
B. Trees or other obstructions
C. Power lines
To allow optimal performance, ensure that the type and placement
of the antennas allows sufficient clearance of the Fresnel Zone at
the maximum width of the bulge, typically at the midpoint between
the antennas. For more information, see
Chapter 3 - Determining
Range & Clearance
.