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Airband or Aircraft band is the name for a group of frequencies in the VHF radio spectrum allocated to radio communication in civil aviation,

Different sections of the band are used for radionavigational aids and air traffic control.

The VHF airband uses the frequencies between 108 and 137 MHz.

ELT (Emergency Locator Transmitter) Is a type of distress beacon used in aircraft activated automatically by the impact of an accident or manually via a remote control switch.
Once activated, the 406 MHz distress signal is transmitted continuously, alerting international rescue services to the emergency and your location via the global Cospas-Sarsat Search And Rescue satellite system and 121,5 MHz (homing), some also 243 MHz.
Some models have GPS or You can be connected to one.