Purpose
Before the construction of Sutro Tower, television reception in San Francisco was spotty because the many hills of the city would block the line-of-sight television signal. The great height of the new tower helped to resolve that problem. Transmitters had been scattered throughout the Bay Area, including at San Bruno Mountain, Mt. Allison, Monument Peak, and Mt. Diablo. By having all the main Bay Area television station transmitters in one location, reception was improved by allowing a receiving antenna pointed in a single direction to receive all those stations rather than a subset. However, after the NBC affiliation was transferred to KNTV, that station chose to broadcast from San Bruno Mountain which is five miles south of Sutro Tower. This prevents non-cable subscribers in much of San Francisco from receiving any NBC broadcast.
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