radio wave

A small number of broadcasters and non-profit organisations transmit information into the country in the dead of night on short and medium radio waves, so North Koreans can tune in to listen in secret.

In a semi-rural location, it has a good line of sight and as radio waves travel in a straight line , it is easy for a pilot to move things in.

This is a different kind of World War II love story, about a hidden jewel and the power of radio waves and the mysterious ways in which human decency can survive even the cruelest circumstances.

As well as brightening the sky and interfering with astronomy through their flashes and radio waves, satellites pollute the atmosphere on launch and on re-entry, as research from last October underscored.

But simulating visual imagery based on radio waves is an unusual approach for robots and autonomous vehicles.