Coverage of the C.A.R.L.A. SystemThe C.A.R.L.A. System provides coverage across a wide area of Northern & Central California, and Western Nevada. In addition to basic descriptions of coverage, we've also provided graphical coverage maps, as they say a picture is worth a thousand words.
For more information on the coverage of any particular system, please visit The System page and click on the system of interest.
Our Interactive Coverage Maps allow you to see the different system locations and coverage plots in various combinations, utilizing Google Maps. Great for comparing the coverage of two different systems at once.
Coverage OverviewSystem 2: The flagship system located in the heart of downtown San Francisco since 1980. Even though it is at 600', it covers most all of San Francisco, South along the peninsula, and parts of I-280 to San Jose, back up the East Bay corridor through Vallejo and East out Hwy 24 to I-680. North into Marin, Sonoma and Napa Counties as well as parts of the I-80 corridor out towards Sacramento.
System 3: Located near Point Arena/Manchester and has coverage along parts of Highways 1, 20, 101, 128, and 253. This machine can be heard from from Gualala, Manchester, Point Arena North along Highway 1 to parts of Mendocino, Fort Bragg, Cleone and beyond. Also it offers some coverage along Highway 101 from Willits, Hopland and Ukiah down to Cloverdale and North of Healdsberg near Santa Rosa as well as parts of Clear Lake. It also offers coverage in most of the Anderson Valley including Booneville and Yorkville.
System 4: Located in Greenfield has coverage from south of Salinas to San Ardo including Chualar, Gonzales, Soledad, Pinnacles Ntl Forest, Greenfield and King City along the Hwy 101 corridor.
System 5: Located in the East Bay hills at around 1,500' elevation. This machine has wide area coverage including most of the greater S.F. Bay Area from Marin County, Sonoma and Napa Counties. Lafayette, Walnut Creek, Concord, Martinez, Pleasant Hill, as well as Antioch, Pittsburgh, Bay Point on out Hwy 4 and 12 to the Stockton area. The system also reaches out along many parts of the I-80 corridor through Fairfield, Vacaville, Sacramento, and Auburn. This system has reduced power & coverage due to PAVE PAWS.
System 6: Located in Glenn County, in the Snow Mt. Range near the towns of Stonyford and Maxwell, approximately 100 miles South of Shasta, at just under 7000' elevation. This high-level, wide area coverage machine covers from around the Shasta Lake area South through Redding, Red Bluff, Willows, Chico, Yuba City and Oroville down along the I-5 and Hwy 99 corridors to Sacramento. It picks up West around Vacaville and follows a similar path to system 5, Eastward, through the I-80 corridor through Dixon, Sacramento, Auburn, Foresthill and marginally into the foothills and Sierras. Power and coverage have been significantly reduced due to PAVE PAWS.
System 7: At 800' above San Jose with primary coverage in the South Bay Area, it also covers the Redwood City Peninsula on up to San Francisco on I-280 and I-101. It can also be accessed along the East Bay corridor up I-880 into Oakland. It is currently linked into the system but suffering interference from un-cordinated ATV operations in the UHF link band.
System 8: Located at beautiful Lake Tahoe. At over 8,600' above sea level, it overlooks the West Shore, most all of the basin including North through Tahoe City, Carnelian Bay, Kings Beach, Stateline and Incline Village. It covers even more solidly across from it along the East/South side from Sand Harbor through South Lake Tahoe. It can be worked along Emerald Bay on up through Meeks Bay, Tahoma & Homewood but not as solidly. It can even be brought up, marginally, over the East side of Spooner Summit and down into parts of the Carson Valley and highway 50 corridor around Strawberry, Twin Bridges, Kyburz and parts of the Sacramento Valley.
System 9: Located in Stanislaus County near the town of Westley on Mt. Oso near Modesto, at 3100' elevation. This high-level, wide area coverage machine covers the entire Central Valley from Sacramento in the North to Stockton and South towards Madera and Kettleman City. It covers the East part of the Central Valley from Sonora towards Fresno and even to the West side of Yosemite. The power output and coverage have been significantly reduced due to PAVE PAWS.
System 10: Located 3500 feet above sea level in the Santa Cruz Mountains. It covers Monterey, Salinas, Watsonville, Santa Cruz, Scotts Valley, Morgan Hill, Gilroy, and south to Solidad. It also covers from San Jose to Marin County and along the I-880, I-280 and Hwy 101 corridors in the Bay Area.
System 11: Located in the Walnut Creek area in Contra Costa County. It covers the I-680 corridor from I-80 to I-580 and can be heard in the Fairfield-Suisun area and in some parts of the Pleasanton/Livermore Valley. It also covers the I-24 corridor from I-680 to the Caldecott Tunnel.
System 12: Located in the town of Pleasanton, is a low level machine covering the Livermore Valley. It
has coverage from the west side of the Altamont Pass to the east side of the Pleasanton
grade on I-580. It can also be heard north and south of the I-580 / I-680 junction for several
System 13: Located just north of Lake Shasta, covers the entire lake and surrounding areas. It has coverage from the base of Mt. Shasta to just about Corning on I-5. It also covers east and west of I-5 in the mountainous areas around that part of I-5.
System 14: Located above Cisco Grove, this machine provides coverage in the I-80 corridor just east of Donner
Pass (over the summit towards Truckee) to the 4,500 ft. level on I-80. It also covers the HWY 20
corridor from the I-80 junction out towards Grass Valley, Yuba City, Williams, Willows and Colusa
County. This machine can also be heard on I-505 between Vacaville and Dunnigan and up I-5
System 15: Located on Joaquin Ridge near Coalinga with coverage in the Southern Central Valley along the I-5 & Hwy 99 corridors from Turlock & Patterson to Fresno, Bakersfield and Grapevine. This machine can also be heard in a few parts of Yosemite.
System 16: Located on Mt. Vaca in Vacaville with coverage in the Sacramento Valley along the I-5 & Hwy 99
corridors from Dunnigan to Merced and eastward towards Auburn. This machine can also be heard
in some parts of the San Francisco Bay Area. Power & coverage have been reduced due to PAVE
System 17: Located on Cedar Ridge near Sonora at 4300' elevation. This high level repeater covers Sonora,
Angels Camp, Oakdale, Twain Harte, and the surrounding areas. It also covers I-5 and I-99 from
Sacramento to south of Merced and works quite well on SR-120/SR-108 towards Yosemite.
System 18: Located above Topaz Lake near the Nevada/California border approximately 20 miles south of Gardnerville, NV. It covers the entire Topaz Lake area and Antelope Valley which includes the towns of Topaz, Coleville & Walker along Hwy 395. Solid coverage at Holbrook Junction and the towns of Wellington, Smith & Yerrington. Moderate coverage in the towns of Gardnerville, Minden and Washoe City. It can be brought up in parts of Carson City and Reno as well as Hwy 89 along Monitor Pass and along parts of Hwy 88/89.
System 19: Located above Hayward at 1500', it covers the Tri-Valley area of Pleasanton, Dublin, Livermore and most of the SF Bay Area from South San Jose up through Oakland, San Francisco and parts of Marin.
System 21: Located at 5450' overlooking the Reno/Sparks area. It blankets the Reno, Sparks, and Sun Valley areas and covers I-80 west out to Verdi and Boomtown and east out towards Mustang and Fernley. It covers parts of the Carson Valley going southbound towards Carson City/Minden and up to the crest of the Mt. Rose Hwy, US-341. It covers north on 395 to Cold Springs and can be heard beyond there. It also covers out to Spanish Springs on US-446 and up Hwy 445 (Pyramid Lake Hwy) towards Pyramid Lake Reservation area.
System 22: Located near Hawthorne Nevada at 10,300 feet elevation. Due to its high elevation this repeater's coverage touches several counties including Mineral, Lyon, Mono, Douglas, Churchill, Inyo & Esmeralda. Coverage includes Hawthorne, Walker Lake & Valley, Coaldale, Goldfield, Sweetwater. Hwy 395 from the Carson Valley through Minden, Gardnerville & Topaz. It picks up again around Bridgeport and South through Lee Vining, Mammoth Lakes, Mono Lake, June Lake, Bishop, Big Pine & Owens Valley. It covers out Hwy 6 to Coaldale, Tonopah, Benton & Basalt. Towards the North end of its coverage is Nixon near Pyramid Lake and parts of Fernley & Lovelock along I-80, and on Hwy 50 starting East of Fallon to Cold Springs, Stillwater and Dixie Valley. Along Route 95/95A corridors includes Fallon, Wabuska, Yerrington, Luning, Mina, Mason, Smith, Wellington, Schurz & the Smith & Mason Valleys.
System 23: Located at over 9700' overlooking the Reno/Sparks and Lake Tahoe Basin areas. It also covers the Washoe & Carson Valleys and parts of Truckee, Fallon, Fernley, and Pyramid Lake.
System 24: Located above the East side of the Carson Valley, this machine fills in areas where other machines somewhat marginal or less than solid coverage. It covers from Reno to the Topaz Lake area along Hwy 395 as well as Fallon and other towns along the Hwy 95/95A corridors.
System 25: This system covers into the I-5 corridor towards Lake Shasta and south to the Williams area. It
covers the very northern part of the valley around Redding, Anderson, Corning, Red Bluff very well.
It also gets into Whiskeytown to the West.
System 26: This system is located above the Alexander Valley overlooking the Highway 101 corridor of Santa Rosa, Healdsburg, Cloverdale, Windsor & Geyserville. It also covers the towns of Sebastopal, Graton, Forestville and parts of Guernville. It has some coverage North to Ukiah and South to Petaluma as well as west into parts of the Anderson Valley & a few select spots of Bodega Bay & Jenner.
System 27: Located above Quincy on Mt. Hough, This site covers the entire Quincy area very well plus has coverage West out Hwy 70 along the Feather River Canyon and East towards Graegle. It also covers a good portion of the Lake Almanor area to the North.
System 28: This site located near McCloud CA., covers part of the Hwy 89 corridor near McCloud and back into the Mt. Shasta City area and north along I-5. It makes it to Yreka in places but is on the ragged edge of coverage at that point. It covers down the i-5 corridor through Dunsmuir to the Redding area.
System 29: From the North along US-101 coverage starts at about Camp Roberts and continues South along the 101 corridor all the way to Santa Maria and just North of Los Alamos. It covers to the West along Hwy 1 from San Simeon to the North to parts of Lompoc & Vandenberg AFB to the South.
System 33: This system covers parts of the "Mendonoma" coast area from South of Pt. Arena through Anchor Bay, Gualala, The Sea Ranch and Stewarts Point and ends just north of Salt Point State Park along Coast Highway 1. There is also limited coverage in the towns of Annapolis, Cazadero and other spots along the ridgeline overlooking the coast.
System 35: Located in the East Bay hills at around 1,500' elevation at the same location as CARLA 5 (UHF). This machine has wide area coverage including most of the greater S.F. Bay Area from Marin County, Sonoma and Napa Counties. Lafayette, Walnut Creek, Concord, Martinez, Pleasant Hill, as well as Antioch, Pittsburgh, Bay Point on out Hwy 4 and 12 to the Stockton area. The system also reaches out along many parts of the I-80 corridor through Fairfield, Vacaville, Sacramento, and Auburn. This system essentially has the same coverage that CARLA 5 used to have prior to the PAVE PAWS power/coverage mitigation efforts.
System 36: This system covers all of the North Sacramento Valley from Redding to the North to most of Sacramento to the South and the foothills to the East. It has a directional pattern favoring the North-West to minimize co-channel interference to the South-East, where it has a null.