In a standard wireless network--such as those used by cellular vendors like Sprint PCS (nyse: FON - news - people )--a central antenna or base station always acts as middleman in any communication.

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The base station simulator should have been also sitting outside the chamber and had a calibrated antenna plumbed to it from inside the chamber.

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All its computers now include a built-in antenna which, in conjunction with a networking card, can exchange data with a small base station plugged into a broadband Internet connection up to 45 metres (150 feet) away.

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