But we don't know what kind of information - if any - an incoming signal might contain.

The incoming signals all come in from open space, and we can't do anything about that.

No point in worrying about the security of incoming signals.

There'll be an incoming signal, probably, in a couple of days.

"Monitor for any incoming signal from them and advise me at once."

But the little window on the comm showed no incoming signal.

Some time later there was a ping of an incoming signal.

The central issue here is frequency of the incoming signal.

The Immortals' staff was just coming to terms with the incoming signals.

The technology works best when the incoming signal is strong and sharp.