Whilst semi-invalid after a hip replacement (quarter-wave on 70cms since you ask) I thought I might produce a powerpoint presentation on "the use of radio for information and propaganda" largely based round WW2 and discovered this:
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It's not just a radio tower but, at 387 feet, it's the tallest wooden structure in the world at Gleiwitz, Silesia. It was built in about 1938 and is still in use today. If you want to build one, it's treated larch with brass fittings, Obviously the Germans denuded the local forests of larch trees to build this. There's no record of the preservative used but that should be no problem.
The story about the radio station makes interesting reading too.