Enterasys Networks Outdoor Antenna ユーザーズマニュアル

Determining the Antenna Locations

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The following describes other requirements to meet before installing the RoamAbout 
outdoor antennas. 

•

Lightning Protection

A lightning rod must be placed close to the antenna mast or wall bracket. This is 
required to protect the antenna from direct lightning strikes.

•

Grounding System

Direct earth grounding of the antenna and the Lightning Protector is necessary to 
protect the installation from lightning and the build-up of static electricity. The 
wireless device and the Lightning Protector must be connected to the same earth 
ground using separate grounds. The antenna and the mounting structure require 
separate grounds to the same earth ground, using an equipotential bonding conductor. 
Check with a certified antenna installer to make sure the antenna is properly grounded.

Ensure that the cable between the antenna and Lightning Protector is at least 0.9 meters 
(3 feet) away from high-voltage or high-current cable.

•

Antenna Height

If you are mounting the antenna on a roof, it must be at least 1.5 meters (5 feet) above 
the roof line.

If you are mounting the directional antenna to a wall of a building, it must be high 
enough to achieve a clear line of sight. Mounting an omni-directional antenna to the 
side of a building can cause signal reflection and reduce distance.

•

AP placement

The AP should be located indoors and connected to the outdoor antenna with a 
standard 6 meter (20 foot), 15 meter (50 foot), or 22 meter (75 foot) low-loss cable. A 
longer cable could cause additional signal loss and decrease the distance between 
antennas.