MARK WILLIAMSON / SCIENCE PHOTO LIBRARY MARK WILLIAMSON / SCIENCE PHOTO LIBRARY
A microwave communications link horn antenna on a tower in Tucumcari, New Mexico, USA, just off Historic Route 66. The transmitted signal enters via waveguide at the foot of the tower, travels up the tower waveguide to the horn, where it is converted to a free space wave and reflected though 90 degrees for onward horizontal transmission.
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