radio beam

Each star acts as a giant clock, precisely stabilized by its immense mass, “ticking” with every rotation as its radio beam sweeps past.

We can have no warning, I suppose; your ship will outrace the radio beam.

Her directed radio beam flashed the yellow call signal in O'Malley's control room.

"A way of transmitting real power in a radio beam," said the 'copter man.

It'll be simple for them to send out a radio beam and touch our invisible ship with it.

The rockets of the tiny missile were flaming, but that flame was visible only from the rear and no radio beam was upon it.