NFL owners voted Wednesday to tentatively award Kansas City a Super Bowl, largely as a tribute to owner Lamar Hunt, who gave the game its name. It comes with one giant string attached: improvements to Arrowhead Stadium, including a rolling roof to keep out the February cold. The team estimates the cost of the roof alone at $100 million to $200 million -- and that's not counting $300 million or so the Chiefs say they need in stadium upgrades. The approval is for a 10-year window, starting in 2011, but Hunt said the most likely prospects would be for the 49th or 51st Super Bowl, after the 2014 or 2016 seasons. "This is a very happy day, and in some respects a surprising day," he said at a news conference after the second day of the owners' two-day fall meeting adjourned. "This is something our organization has talked about for a number of years."