TORONTO – While the recent advanced wireless spectrum auction has no immediate ratings' impact, the outlook for the Canadian Wireless sector has been revised to stable from positive because of prospective changes in the business environment, Moody's Investors Service said Wednesday. "The auction is one milestone in a series of events that are expected to unfold over the next three-to-five years," says Moody's vice-president Bill Wolfe. In the near term, participation by new entrants is expected to increase competition. "The number of spectrum holders has increased in every region, and most now have at least one new entrant with a...