Broadcast Tower KT8

It's located north/northeast of Vault 87, south of Shalebridge in the mountains.

There's only a radio antenna and its generator (the latter's switch can be flipped to emit Radio Signal Sierra Romeo). Quite a few bent metal girders on the site suggest a destroyed structure bigger than a mere fence.

A couple super mutants and possibly a centaur (random generated) can be found wandering the area. If the player visits this area of escaping Raven Rock there will be a small scene with missiles being fired at a Vertibird passing overhead (presumably by the Super mutants)

Just slightly to the northeast, below the cliffs the broadcast tower is built upon in the alleyway that cuts between the rocks you will find  "Sewer Entrance to Drainage Chamber" inside you will find collapsed sewage tunnels and a door. In this room should be random custom-weapon items, and two computer terminals. One is broken, the other opens the secure hatch in the floor, unveiling the source of Radio Signal Sierra Romeo, a ham radio along with the remains of two Chinese Remnant Spys, a Chinese Army: Special Ops Training Manual, and a Mini Nuke under the table.