Broadcast Tower KT8

The  is 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 typical mutant outpost.

A couple super mutants and possibly a centaur (random generated) can be found wandering the area. If the player visits this area after escaping the Jefferson Memorial through to the Citadel there may be a small scene with missiles being fired at a Vertibird passing overhead (presumably by the Super mutants)

Drainage Chamber
Just slightly to the north, 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 requires a decryption key to open the secure hatch in the floor, unveiling the source of Radio Signal Sierra Romeo. The decryption key is on top of the desk in the same room.

In the subchamber, you'll find a ham radio along with the remains of two Chinese Remnant Spies. It's unclear what killed the two spies (unlike other towers where you'll often find clear signs of raider violence), but it is a possibility that they starved to death or obtained radiation poisoning, even though there is plenty of food in the computer chamber. There are two Purified Waters under the table along with a mini-nuke. Also, there is a Chinese Spec. Op. book laying on the table next to the radio. You can also recover a Chinese Commando Hat as well as Chinese commando clothes.

Interestingly enough, if they are resurrected in console, they have normal ghoul voices instead of Chinese voices.

Notable Loot
There are two Pre-War Books in the room with the computer terminals.

There is a mini nuke, a Chinese Commando Hat, and a copy of Chinese Army: Special Ops Training Manual in the sub-level with the two spies.