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Microsoft Tests Super-Size Wireless Hot Spot in TV Channel Gaps

Microsoft Corp. has turned its headquarters campus into a single wireless hot spot, giving workers in scores of buildings and aboard a shuttle bus a steady Web link to test a potential $4 billion market.

Google Inc., Hewlett-Packard Co., Motorola Inc. and Sprint Nextel Corp. are also making plans for a new era of wireless video and data traffic using vacant airwaves previously reserved for television. The U.S. Federal Communications Commission plans to vote Sept. 23 on releasing the spectrum for nationwide use.