Just poured the base for my 70' Rohn 45. Also poured the guy anchors too. With the large hole, have about 3/4 yard in each dead-man W/rebar and 1 yard in the base. Used a sawed off tower section for the base. It was about 6 feet long. Now to let the concrete cure for a while... 73 Jim W7RY Yacolt WA