[Sprint's buy of Nextel makes it the biggest WiMax airwaves provider in 80 of the top 100 US markets.]

By Sinead Carew, New York -- "U.S. cities and companies are eyeing an emerging technology known as WiMax as a way to make high-speed wireless Internet services available in areas much larger that a typical Wi-Fi coffee bar or the local McDonald's. But it may prove difficult to make such services commercially viable, analysts say."

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