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 ...

In 1938, the director of the Signal Corps Laboratories at Fort Monmouth, New Jersey, Col. Roger B. Colton, transformed ...

HF radio is known for its ability to provide long-distance communication by bouncing signals off the ionosphere (a process called skywave propagation). This makes it valuable for military ...

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 ...

A ray gun that uses high-frequency radio waves to take out enemy drones and costs just 10p to fire has been successfully trialled by the British Army. The radio frequency-directed energy weapon ...