In the 1950s through the 1970s CAP volunteers with crystal - controlled CBs would put this frequency in their radios .
The Civil Air Patrol has 26.620 MHz , though it now uses mostly VHF frequencies .
In the 1950s through the 1970s Civil Air Patrol volunteers with crystal - controlled CBs would put this frequency in their radios .
The Civil Air Patrol has 26.620 MHz , though it now uses mostly VHF frequencies .