Although some parts of the unused broadcast spectrum are earmarked for use by the military, TV stations and the police, its commercial use for unlicensed devices is considered highly problematic by broadcasters, who believe the devices will disrupt TV service. "The prototype tests up to this point have consistently shown failure," said NAB spokesman Dennis Wharton. "That doesn't give us a whole lot of comfort when there's a potential of thousands or millions of these devices operating without any protection to ensure that our broadcasters are able to get clear picture to our viewers."

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