Signal Sierra Victor

A radio transmission in the vicinity of Jocko's Pop & Gas Stop. The large antenna tower near the station entrance can be turned on after unlocking the gate. Once the power is restored, it begins broadcasting morse code. The station generating the transmission is in a drainage chamber reached via a manhole. The manhole is on the opposite side of a downed radio tower near the antenna.

Morse code translation:

CQ CQ CQ DE SV SV SV K

This translates to "calling anyone, this is Sierra Victor, over".

The broadcaster seems to have set a number of traps and barricaded himself in the room before expiring.