Since icebergs travel fairly slowly, over-the-horizon radar can spot them 100 miles off, and ocean tugs try to push or tow them out of the way.

It did pick up some odd radio signals, probably sounds from over-the-horizon radar and submarine communications.

Most military commanders wanted up-to-date imagery from reconnaissance satellites, over-the-horizon radars and infrared sensors, but they often could not get it.

Another talking about "over-the-horizon radar"-a catch phrase I'd found in an electronics magazine.

Here they have also been used to represent the radio propagation element of practical systems providing high frequency communication, direction finding and over-the-horizon radar.

The laboratory first proposed a nuclear submarine in 1939, and developed over-the-horizon radar in the late 1950s.

His most famous work may be his 1959 efforts in over-the-horizon radar, which worked by reflecting high-frequency radar from the ionosphere.

Refraction for over-the-horizon radar uses variable density in the air column above the surface of the earth to bend RF signals.

Early-warning over-the-horizon radars utilize such low-frequency radio waves.

The concept became known as over-the-horizon radar.