This signal is first discovered when the Sole Survivor activates the relay dishes at relay tower 0BB-915. The source of the signal can then be tracked to a ham radio inside a bunker beneath a large makeshift trailer.
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Anyone out there interested in buying some chems? Come find me. I'm at the three trees with flags. Wait for me there, and I promise you won't be disappointed. These chems will really take your head off and spin it around.
This has been a pre-recorded message. Message repeats in three seconds.
The Raider radio signal appears only in Fallout 4.