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this is true for the regular GNR throughout the game.
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It also appears that you have to skip over the quest "Galaxy News Radio" where you help boost the signal so that the station can be broadcast further than just the immediate DC area. It appears that you must kill Three Dog, because no one has reported hearing the numbers station with him still alive. No one is really sure which actions are needed to hear the numbers station in Fallout 3. Simply check Wikipedia for more information about these odd broadcasts as they relate to the real world. Many of these exist in real life and some hypothesize that they are a nuclear retaliation control network. What most players do NOT know is that under certain circumstances, GNR will become a "numbers station." A numbers station is a station that broadcasts an unusual coded message. Once Three Dog is dead, you're stuck with Margaret. She also never appears in person, and therefore cannot be killed. She is not a charismatic person and has very little to say, seeming to not enjoy her new announcing duties. Many players of the evil persuasion know that you can kill Three Dog and he will be replaced by the technician Margaret. The most diverse and important station is Galaxy News Radio. Fallout 3 contains several in-game radio stations.
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