This mast used to be the height of @RoyalNavy training. When they used to regularly hold "Mast Manning" displays. (Look it up on YouTube). One volunteer would shin up the last 15 feet (with no safety lines, or rigging to use as a support) to the very top approximately 143 feet from the ground. (missing on this image as the mast is split at the top). And there he would stand on the "button" holding a thin wire aerial behind his back.
All this was done in time to music.
The mast was erected in 1906 weighing 24 tons with an additional 20 feet buried beneath the concrete of the now derelict parade ground.