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For very specific cases, it may be necessary to use a directional antenna.
The following explanations describe the two types of antenna and the
special circumstances in which the directional antenna may be used.
3.1.2.2 Omnidirectional antennas
Omnidirectional Antennas radiate their RF pattern spherically, providing
coverage in all directions. These are best suited for multipoint links and
are used at all forwarding sites.
Omnidirectional antennas are the preferred solution to most installations.
Side View
Top View
Omnidirectional Antenna - RF Radiation Pattern
3.1.2.3 Directional antennas
Directional Antennas focus the RF beam in narrow patterns in one
direction and provide communication over greater distances than
omnidirectional antennas, but they are limited in the areas they cover.
Directional antennas are useful for long distance or point-to-point
NOTE:
contacts, but prevent future growth of the network, by preventing the
wireless router from repeating signals to other units. They should be used
only when where an omnidirectional antenna will not work.
Nokia RoofTop™ Wireless Router Installation Guide
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