Danny Stuckey, age 15, of Fargo, N.D., for his question:

CAN YOU EXPLAIN THE ULTRAHIGH FREQUENCY WAVE?

Ultrahigh frequency wave is a very short radio wave, from 0.1 to 1 meter long. UHF waves range from 300 million to 3 billion hertz, or cycles per second.

In the radio spectrum the ultrahigh frequency waves become between "very high" frequency waves and "super high" or microwaves. All of these high frequency waves have certain characteristics that make them different from a standard broadcast waves, which have a lower frequency and a longer wave length.

UHF waves, when sent from reflectors or directional antennas, are transmitted in a narrow path and travel in a straight line. UHF waves can also be reflected, like light waves.

UHF waves, very high frequency waves and microwaves have been developed to their greatest usefulness in television, radio, "proximity fuses," guided missiles and radio aircraft equipment.

These frequencies are far above the ordinary broadcast and can therefore be used without interference. They are similar to light in that they can be projected into a beam in any direction desired.