Huawei B311-520 Quick Start Manual page 7

Installing external antenna
In addition to the build-in antenna designed to satisfy your basic needs, you can also install external antenna
to the router to improve signal reception. Please contact your carrier to purchase the antenna.
Turn off the router and unplug the power adapter before installing any external antenna.
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External antenna is only suitable for indoor use. Do not use external antenna during
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thunderstorms.
Only use external antenna provided by your carrier.
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