Greenbriar radio signal

The  is a localized radio distress broadcast that can be tuned into throughout a portion of the Commonwealth, in Fallout 4.

Characteristics
This signal is first discovered when the Sole Survivor activates the relay dishes at radio tower 3SM-U81. The source of the signal can then be tracked to a ham radio inside the Greenbriar bunker by the Crane River.

Appearances
The appears only in Fallout 4.