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It would act as a radio beacon for the planes.

And it was the site, in 1921, of the world's first permanent radio beacon.

"I think they've got a radio beacon on it somewhere, is how those guys found us."

But for security reasons, it has had to give up the idea of turning off all the radio beacons.

It was a small radio beacon, the kind used by police and intelligence agencies to track someone without having to get too close.

A radio beacon could be connected to the brake light, for example.

The Marines were sending out a radio beacon for him to home on.

The radio beacon would be three and a half times taller than any building in Ireland.

First, only a tiny radio beacon needs to be carried on the Viking itself.

The radio beacons still might be too far away for an accurate fix.