We owned 10 Communications towers in West Texas and my husband climbed and maintained them for years. This is not your "ordinary" flagpole - due to the height, it must be lighted, which would also mean there has to be a way for a man to climb the thing to replace the lighting......
This is probably built more along the lines of a Communications Tower - and to withstand the pull of the wind on such a huge flag would require a good strong base for an anchor.