Huawei e5180s, User Manual

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6
Using an external antenna (not included):
In areas with poor reception, connect an external antenna to the WiFi
Cube’s external antenna port to improve signal strength.
Note:

Before connecting the external antenna, ensure that the WiFi Cube is
turned off and disconnected from the power outlet.

Make sure the antenna is approved for use with the WiFi Cube.

Only use the external antenna indoors, and do not use it during a
thunderstorm.

To optimize the external antenna performance place it at least 1 meter
away from the WiFi Cube. If you have installed two external antennas,
the distance between them must be greater than 1 meter.