The Admiral pauses on deck after hoisting the Seaman to a height of 63.5 feet (19.4 meters), i.e., to the base of the antenna farm at the top of the main mast. The seaman was up there precisely to get the specific height of the mast, using a laser.
The antennas stand a further 4.5 feet (1.4 meters) from that point. And this is the reason why Peregrinus stood a few days about 100 yards from the MacArthur causeway in Miami, and yet can never go under it, at least not until some day the offending antennas are relocated to the spreaders, or to the mizzen.
Miamarina, 22 May 2014, 8:38 am.