The infobox template in this article is missing some required data. You can help Nukapedia by filling it in.
The radio signal can be picked up randomly while roaming the Island, or, a settler will tell the Sole Survivor about Shipbreaker, which will produce the same result. After tuning into the frequency, the player character will be prompted with speaking to Old Longfellow about Shipbreaker. The broadcast consists of strange noises, resembling wading, which intensify as the player character draws closer to Shipbreaker.
This article is too short to provide more than rudimentary information about the subject. You can help Nukapedia by expanding it.