Radio Frequency Spectrum
RF spectrum is an entire range of all radio frequencies (10 KHz to 30 GHz) that exist and
is divided into different sections or frequency bands or bands
Radio frequencies of common devices include:
Garage door openers, alarm systems: 40 MHz
Baby monitors: 49 MHz
Radio-controlled airplanes: 72 MHz
Radio-controlled cars: 75 MHz
Wildlife tracking collars: 215 MHz–220 MHz
Global positioning system: 1.227 GHz and 1.575 GHz