Canada's planned May 27 wireless-spectrum auction took on some star power Monday when Microsoft co-founder Paul Allen replaced Niagara Networks as the backer behind John Bitove's Data & Audio-Visual Enterprises Wireless, according to the government, which disclosed its list of approved bidders and their partners. Allen's Vulcan Capital joins New York-based private investment firm Quadrangle Group in backing Bitove, one of 27 entities bidding for spectrum.

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