This signal is first discovered when the Sole Survivor activates the relay dishes at relay tower 0SC-527. The source of the signal can then be tracked to a ham radio inside in the basement storage room of Shaw High School.
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Humans, if out there and need help...we help you. Come to Shaw school place. We promise not tear you limb from limb and eat you.
Huh? But I want eat hu...
Yes, I know you do. Look, I'm reading this exactly like you wanted. Remember? It's a trick. You're trying to trick them. With a lie.
Oh yeah, you right.
Right, where was I? We not hurt you, we just want help you.
This has been a pre-recorded message. Message repeats in three seconds.
The Supermutant radio broadcast appears only in Fallout 4.