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A typical laptop has a somewhat feeble 50mw wireless adapter and essentially, the 5MileWiFi booster is a 1000mw (doesn't 1000mw=1 watt?) 2-port USB device including a 9dbi fiberglass external antenna and low-loss cables, that dramatically improves a computer's wireless peformance.
Yep, the results are dramatic: now my network sharing center shows about 20 5-bar networks, when it used to show just two.
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Pictured above is the booster's external antenna. Sorta looks like a digital steeple, doesn't it ... especially since it'll be ushering me online and into today's web campus services.