The multiple W6CX amateur radio repeaters are located on both peaks of Mt. Diablo. Each peak provides beautiful views for amazing distances in all directions, including on clear days, the Sierra Mountains to the east and the Pacific Ocean to the west. But getting there is a hassle, involving an entrance fee and steep windy narrow roads on South Peak; and much worse on North Peak. So I chose a stand-in for this hide.
The repeater site just up the hill from GZ is a critical part of a network of public safety radio sites; serving most law enforcement, fire, medical and other emergency response organizations in Contra Costa and Alameda Counties. Other government groups, such as various Public Works departments, also use this network.
And, to keep the amateur radio theme of this series intact, the local Walnut Creek CERT group has an amateur radio repeater here as well.
For information on Mt. Diablo, see the California state Parks and Recreation web page on it.
For information on the network the site near this GZ is part of, see the EBRICS web site.
If you don’t know what a radio repeater is, see this Wikipedia article.
For more information on Walnut Creek CERT, see this page of the City’s web site.