The two-way radio sites in Northern California include a wide range of mountaintop repeaters, communication towers, and remote transmitter locations that support public safety, transportation, utilities, forestry, emergency services, and private radio networks. These sites are often positioned on high elevations throughout the Sierra Nevada, the Coast Ranges, and other strategic areas to provide reliable radio coverage across cities, rural communities, highways, valleys, and forested regions where cellular service may be limited or unavailable.