Craig McCaw got rich betting on cellphones when they were still brick-size gadgets with just 30 minutes of battery life. These days, he's rolling the dice on another untested concept: a nationwide high-speed wireless network based on WiMax technology.
His company, Clearwire Corp., is trying to cobble together a network to give customers fast, affordable Internet access for laptops and mobile devices in their homes, cars, commuter trains -- almost anywhere. "Nobody has fulfilled the dream of what mobile broadband could be," says Mr. McCaw, 58 years old, who has been working at it for more than a decade.
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