Unintelligible radio signal

Unintelligible Radio Signal is a radio signal in The Commonwealth in Fallout 4. It can be found when activating the Relay Tower 0DB-521 in the Glowing Sea, wich emits from a Ham-radio in the Hopesmarch Pentecostal Church.

If you listen closely, you can make out breath and groan noises from ghouls. When you arrive at the church, you can find several ghouls and a safe upstairs.