THe advantage of a conductive mast, properly set in the ground and grounded, is that it is a lightening rod and protects nearby buildings against direct hits. A non conductive mast does not do this.
I am thinking the person making the claim thinks the conductive mast may protect the radio as well as the building.. If that is the case.. He is very very very mistaken... Though that said.. I have seen radios survive a direct hit to the tower.. but those were hardened radios. (Military/Police specifications installed by Police certified Ham/Professional Radio operator/engineers who knew exactly what they were doing).
Though I got to say it was a fun day at work when it happened.
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