A timber antenna mast. Post 2154.
While most antenna masts these day seem to be built from various metals, telescoping fiberglass poles, and PVC pipe, a few adventurous radio amateurs are returning to "classic" wooden masts that were common a century ago.
In this post from Peter Parker (VK3YE), we see how simple a wooden antenna mast can be if you are careful in designing and building the structure.
Here are some of Peter's observations: