A large radio tower atop a hill is surrounded by 3-4 bloodbugs, some brahmin corpses, and a trader's corpse near the stair of the tower. Around the base of the tower are the scattered remains of a trading caravan with no loot of significance. The relay terminal has an unlocked computer with the option to "Extend satellites to amplify signals in the surrounding area". Activating that will get you several radio signals that weren't available in the area before. North of the tower, a building with a moving searchlight can be seen. Inside there's a bed and an expert computer terminal, that has protectron controls and spotlight controls. The road just to the north is a patrol route for various enemies.
- Automated radio alarm, an emergency signal coming from the Mass Fusion containment shed.
- Greenbriar radio signal, a distress signal coming from an underground bunker located east of the radio tower.
- Nautical radio signal, a mayday signal coming from a boat stranded on the shore of the lake to the northwest of Breakheart Banks.
Radio tower 3SM-U81 only appears in Fallout 4.