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Are there any devices that do not need to be physically connected to a network (only to a power source) and just take any WiFi signal they receive and reproduce it in order to increase the range of a WiFi network?

If so, how are such devices called? Google just gives me strange DIY guides if I search for "WiFi extender".

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I would Google for "wifi repeater" –  RedGrittyBrick Sep 29 '11 at 15:50
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up vote 1 down vote accepted

What you're looking for is a wireless repeater, such as the Netgear WN3000RP.

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It's call wireless repeater. In fact is just another wireless router configured in a special way. Check these links:

I'm linking to the DD-WRT firmware page but some routers have this feature built in. Depending on your case you could just upgrade to 802.11g to 802.11n to increase your range/speed.

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