Your description claims this extends the wifi range. Has this been proven? And how does it do this?

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That claim is a little misleading.  802.11 A/C supports "beaming" which is basically an electronically steerable antenna.  This allows the airport extreme to "focus" power in a particular direction for a particular device or set of devices.  By using this cap with the base you can mount your airport in any orientation and location including upside down.  This allows you to "point" it which will improve coverage area in some directions.  So the improvement is derived from being able to mount your airport in any orientation and not from any magic in the plastic cap itself.

ASIN	B00L5JFW4E
Customer Reviews	4.4 4.4 out of 5 stars (80)
Date First Available	June 25, 2014
Is Discontinued By Manufacturer	No
Item Weight	2.4 ounces
Item model number	Apple AirPort Extreme and Time Capsule
Manufacturer	Giros Design
Product Dimensions	7 x 1.5 x 4.5 inches

AirGuard: Polycarbonate Security Cap [AirBase Mount for Apple Extreme/Time Capsule NOT Included]

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