My family and I have taken refuge in a drainage chamber not too far from a radio relay tower outside of D.C. My boy is very sick, needs medical assistance. Please help if you can. We're listening for your response. 3950 kilohertz.

There are seven drainage chambers and two sealed cisterns scattered around the Capital Wasteland in 2277. These are minor dungeons, and all are home to radio stations broadcasting Morse code (except Oscar Zulu and Yankee Bravo). The particular message is explained at length on the page for signal Kilo Bravo. Many of the stations do not have a map marker but can be spotted by looking for the tower.

All have a transformer at the base of the tower with a switch to throw that starts the encoded broadcast, except Kilo Bravo, where the switch is inside WKML. The entry to the underground ham radio station will be nearby. It is possible to zero in on the broadcast, coming from the sewer grate or manhole cover, not the tower itself. They have a short broadcast distance of roughly 200 yards (183 meters).

At the edges of the broadcast, it is entirely static. At its source, there is no static and the signal can be heard clearly. Turning off the ham radio stops the transmission. It can be turned back on, in which case it needs to be selected in one's Pip-Boy again to hear it.

Signal stations

The numbers in [brackets] denote the drainage chamber's designation in the G.E.C.K. For example, signal Kilo Bravo is interior location FFRadioCache01 and its unique radio (with broadcasting script) is designated FFHamRadio01. The FFHamRadio records also show the signal names.


  • Many signal chambers have at least some purified water, suggesting that they were initially inhabited when the bombs fell.
  • Even if one kills off all the ghouls broadcasting over signal Yankee Bravo, the ghoul's heavy breathing can still be heard over the radio.
  • The reasons for these signals are unknown. The variation in messages suggests that they did not all originate from the same group. The usage of the NATO phonetic alphabet is common for both military operations and ham radio operators, as well as anyone with training in radio communications protocol. There is no information regarding their previous use, aside from the content of the radio messages themselves and the equipment found along with the remains of the radio operators.
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