- - - - on the other hand a magnetic stainless steel tube or radio mast,
used as an antenna element, may/will have an RF resistance loss smaller than
a 14-gauge copper wire which otherwise would have been adequate.

Why? Simply by virtue of its far greater diameter and surface area.

You have the advantages of self-supporting structural ability, durability,
AND lower RF loss, AND wider bandwidth.

A deprived quantitaive familiarity, engineering dependence on popular,
plagiarised "Bibles" are dangerous things.

What was it the later, oft-quoted, Lord Kelvin said ?