
As seen from the Marin Headlands
Sutro Tower is a three-pronged antenna tower in Clarendon Heights, sometimes referred to as “Twin Peaks.” It is a dominant part of the city skyline, and a constant landmark for locals.
However, strong local opposition and criticism was directed towards the tower even before it was completed. The two main controversies surrounding the construction of Sutro Tower were local politics and the aesthetic effect the tower would have on the rest of San Francisco.
The Late, Great Herb Caen once said, “I keep waiting for it to stalk down the hill and attack the Golden Gate Bridge.”
Before its construction, television reception in The City was quite spotty, as the many hills of the city would block the line-of-sight radio waves — this was before the rise in popularity of cable television. Before Sutro Tower, transmitters were scattered throughout the Bay Area, including at San Bruno Mountain, Mt. Allison, Monument Peak, and Mt. Diablo. Reception outside of San Francisco was incrementally improved by the tower. By having all the main Bay Area television stations in one location, reception was improved by allowing all receiving antennas to be pointed at one tower instead of many.
Construction began in 1971, by Kline Tower, and was completed in 1973, with the first transmissions from Sutro Tower on July 4, 1973. About 3,750 cubic yards of concrete were used to make the foundation of the 3.7 million pound tower. Earthquake proofing includes ballasting two thirds of the weight of the structure below ground, resulting in a center of gravity at sixteen feet below ground level. It is used to transmit ten analog, eleven digital TV stations and four FM radio stations to the San Francisco Bay area.
The tower is owned by Sutro Tower, Inc., which in turn is owned by a consortium of the four major television broadcasters in San Francisco; KTVU, KRON-TV, KPIX-TV/KBCW and KGO-TV, with usage leased to other Bay Area TV and radio stations.
Named after Adolph Sutro, a businessman and former mayor of San Francisco who had a mansion located about 100 feet away from where the tower is now located, the tower stands 977 ft above the ground and 1,800 ft above sea level. It is the tallest structure in the city, surpassing the 853 ft Transamerica Pyramid by more than 100 ft. In addition, it is built on one of the highest peaks in the city, the old site of the Sutro Mansion owned by Adolph Sutro’s descendants.
The original design of the tower called for white lights longitudinally rising along its three legs to the top. When opened, these lights were lit. However local resistance and aesthetic considerations forced the operators to turn off the lights and they have never been used since.
Additional images of Sutro Tower can be seen here.

As seen from Potrero Hill