CradlePoint portable hotspot, we're guessing that Proxicast's Cell-PAK is an entirely better option. Said box, which is described as a rugged, self-powered 3G + WiFi wireless hotspot in a box, was designed to provide "mission-critical wireless communications" in the jungle, on the battlefield or in your backyard. Aside from having its very own battery pack for completely untethered access, the device comes encased in an impact and water-resistant MIL-spec rated chassis, and we're told that it can accept "any 3G modem from any cellular carrier worldwide." We're talking over a dozen hours of wireless access from anywhere that you can retrieve signal, and there's even an external high-gain antenna to help with that. Now, if only that $1,295 price weren't so gigantic...
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Proxicast's Cell-PAK: it's a portable 3G / WiFi hotspot, but rugged