There a door at the bottom at the front, and a ladder that goes up the inside. This allows maintenance on the whistles and nav lights. However to get to the Radar Scanners you had to clip a ladder, kept in the barn, to the bottom rung of a series of external welded on rungs on the port side. To get to the top you had to rig a bosuns chair and that was a job for the A/B's. The other function of the signal mast was an air vent for the galley to lift cooking smells up in the clear.