Boston City Works Beacon

Boston City Works Beacon is a radio beacon in Fallout 4. It is broadcast from an unmarked location close to Relay Tower 1DL-109, approximately halfway to Forest Grove marsh.

Location
The radio broadcast is found when extending the Relay Tower 1DL-109. The signal origin is 89 meters away and can be found by heading west, towards Forest Grove marsh. The location is a waterway lock, and is broadcast from inside the Operations building. Once inside, there is a hatch hidden behind some cardboard boxes that allows access to a small sublevel.

Bugs
Turning off the Ham radio at the source does not shut the radio signal off, and can still be picked up with the Pip-Boy (I can't replicate this)