U.S. wireless carrier AT&T said on Monday it would buy Straight Path Communications, a holder of licenses to wireless spectrum, for $1.25 billion in an all-stock deal. The No.2 U.S. carrier said it would offer $95.63 per share, a premium of 162.1 percent to Straight Path's Friday close. Straight Path's shares were trading at $93.26 premarket, while...