I used to work here and our tower crew just climbed the inside of the tower, all the antennas were facing outwards. Mine were 875' or so. I only turned off my transmitters when the got to my antennas, they were Omni directional and about 1600W@2.5G. »en.wikipedia.org/wiki/Star_Tower
While most omni directional antennas have a narrow vertical pattern I would still have them turned off due to the sidelobes. Unless you are working with a transmitting waveguide there is some backscatter.
