He did some research into the antiquated network, but didn't think to photograph it until years later when he regularly spotted the towers during highway drives. He was intrigued by the hulking structure, especially its distinctive horn antennas, which transmitted microwaves to towers within line of sight. Spencer Harding remembers climbing one of the towers in the Santa Monica Mountains as a high school student in the aughts. But just as microwaves replaced wires, fiber optics eventually replaced microwaves, and AT&T's giant towers were abandoned. The system took three years to build, and the first call was placed on August 17, 1951. AT&T made history 63 years ago when it launched the $40 million microwave radio-relay skyway, a network of 107 microwave towers designed to transmit telephone and television signals nationwide.
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