Bob Anderstein is a character heard on the Oscar Zulu frequency originating at the radio station of the same name.
During the Great War, Anderstein and his family took refuge in a drainage chamber outside of Washington, D.C.. At the time of the transmission, his son was sick and dying (presumably from radiation poisoning) and he was using a radio frequency to call for a doctor to come to his family's sewer hideout. One can pick up the frequency and discover the sewer only to find that the whole family is long gone. The parents' skeletons can be found near the radio, but not the boy's.
Bob Anderstein is only heard in Fallout 3.