Adjacent Frequency Bands
The Business Radio Service has several channels just above the Citizen's Band, at 27.430, 27.450, 27.470, 27.490, 27.510, and 27.530 MHz.
The federal government has the frequencies from 27.540 up to 28.000. Many civilian agencies use, or used to use, the frequencies 27.575 and 27.585 for low-power use.
The 10 meter ham band runs from 28.000 to 29.700 MHz.
Below the Citizen's Band, the U.S. military has the frequencies from 26.480 to 26.960.
The Civil Air Patrol has 26.620, though it now uses mostly VHF frequencies. Years ago, CAP volunteers with crystal-controlled CBs would put this frequency in their radios. Currently VHF military frequencies are more often used, as among other reasons, VHF radios are easier to acquire than crystal-controlled CBs.
Read more about this topic: CB Usage In The United States
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