A backup plan makes good military sense, and the properties of radio waves between 3 MHz and 30 MHz, especially the ability to bounce off the ionosphere, make HF radio a perfect fit. The United ...

The RFDEW disrupts hostile threats by using high-frequency radio waves to damage or interfere ... for single-operator use and can be mounted on military vehicles for enhanced mobility.

A tool called the Automatic Packet Reporting System (APRS) is fairly robust in the very high frequency (VHF) part of the amateur radio spectrum, but this solution still relies on a not ...