If you're not looking closely, it's easy to miss the wi-fi antenna atop San Bruno mountain just south of San Francisco. There are a couple of dozen TV and radio broadcast towers, each about 300 ft. tall, surrounded with chain-link fences and electromagnetic radiation warning signs. The wi-fi antenna is a solitary 18-in. plastic stick that radio engineer Tim Pozar stuck up there on his day off. If it disappeared, fewer than a hundred people would notice. "It takes geeks like me, putting up antennas, to make this work," says Pozar.
What the geeks get in return is nothing short of...
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