The broadcast building is the broadcasting center located on the summit of Black Mountain.
The building has two floors, the lower one houses the infrastructure and other broadcasting equipment, as well as the terminal entries chronicling the history of Black Mountain. The staircase at the back leads to the upper floor, where Tabitha's room and broadcast center for Black Mountain Radio are located. It is initially locked, but the key can be found either on Tabitha or under the rear staircase (a light-colored pile of rocks).
The broadcast building appears only in Fallout: New Vegas.