They followed current events by radio, and knew what was going on in the world.

That car never had a chance to report, even by radio.

I haven't been able to raise anyone, in air or on ground, by radio.

He tried to contact it by radio but got no answer.

He was talking by radio to someone in or around the airport.

I'm not allowed to report the loss by radio, I've got to do it in person.

A system has been developed to report these data by amateur radio.

Not that they'd have noticed any difference if it had gone by radio.

Later he got a print message by radio from deep space.

He reports in by radio, where they notice he's an hour late.