The U.S.S.A. beacon is a miscellaneous quest item in Fallout 76, introduced in the Wastelanders update.
Gameplay
A radio beacon known to be used by United States Space Administration operatives, which has been detected by Commander Sofia Daguerre and is broadcasting a powerful radio signal, indicating that its power source is being replaced regularly.
Locations
The beacon is found in the steamer trunk in the Valley's Boutique shop in the Valley Galleria during Bring Home the Beacon.