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AT&T announced a new project it has been experimenting with. Project AirGig is a new type of wireless infrastructure which is low-cost and is installed onto an infrastructure that's existed for decades: power lines. AirGig essentially piggybacks onto existing power lines and is able to relay a connection using "millimeter wave" (mmWave) signals capable of multi-gigabit speeds to be used as public Wi-Fi access points, home broadband connections, and could be deployed for existing 4G LTE bands and future 5G technologies. AT&T says initial tests showed much promise and it plans to begin field...