In the event of a disaster, local FM broadcasts (88–108 MHz) are often the first to be restored. Much like a community loudspeaker system, they offer several advantages:
A coverage radius of approximately 50 km, making them ideal for receiving local early warnings
Low power requirements; signals can be picked up even by car radios
Accessible content that is easily understood by both the elderly and children
Shortwave Bands: A Bridge for Cross-Regional Information
When local communication networks fail, shortwave radio (3–30 MHz) can overcome geographical limitations:
Day-Night Variation: Higher frequency bands (12–18 MHz) are suitable for daytime use, while lower frequency bands (3–8 MHz) propagate further at night
International Relief: Certain international organizations use designated bands to broadcast multilingual disaster updates
Reception Tips: A rotatable antenna is required, and care should be taken to avoid interference from metal structures
Civilian Emergency Frequency Bands: Channels for Self-Rescue and Mutual Aid
These frequency bands act like invisible, life-saving hotlines:
The UHF band (400–470 MHz) is commonly used for two-way radios and is suitable for team coordination over short distances.
The maritime emergency channel (156.8 MHz) is available for use by coastal residents.
Outdoor enthusiasts can monitor frequencies coordinated by amateur radio operators.