Generally speaking, WIFI antenna refers to the antenna used in the wireless network. WIFI antenna can be as big as a building or as small as a wire. For consumer home wireless network, if you feel your home signal is not strong enough, you can use WIFI booster antenna on your modem or router to improve the signal. Or use a range expander to transmit the signal, both works to some degree.

WIFI antenna have different applications, now there use a lot for cellular applications including wireless routers, telemetry and telematics application where the cellular capability is required.

For example, the wireless remote carmera

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