Extending from the San Joaquin Valley floor into the high peaks of the Sierra Nevada, high-altitude repeater systems provide vital radio coverage across vast alpine wilderness areas. Maintained by mountain clubs such as the Mountain Amateur Radio Club (W6BW) in Oakhurst and TCARES (K6TUO) in Sonora, these repeater systems bridge communications across Mariposa, Tuolumne, and Madera counties. Positioned at strategic elevations exceeding 7,000 feet, these mountain relays offer extended VHF/UHF coverage into Yosemite National Park and remote foothill corridors. Amateur operators frequently assist local Search and Rescue (SAR) teams, providing auxiliary communications during mountain backcountry emergencies, forest fires, and winter storm rescues. Their continuous technical maintenance ensures that travelers, hikers, and emergency personnel remain connected even in deep granite canyons.
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