I've been looking into increasing the size of my field mast, and as a result am again attempting to come up with a guying solution for it. (As of today, I've actually got another section of tube for it, so it will be almost doubling in size soon – hopefully more info as it comes to hand this week-end.) While searching for guy rings, I came across the article on the rather substantial yagi VK3MO used to have for 20m. What drew me to it initially was:
Each of the guy ring assemblies weights 200kg.