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Yes, the tower's manufacturer should have recommendations and probably even diagrams showing just how to construct the base. I put up a  MA-40, 20/40 foot tubular telescoping tower (non-guyed). Dug the hole approx. 3x3x3 feet. Didn't get down the full 3' because I hit rock. I built an internal frame out of rebar and placed it in the hole. It's been a while, but I think I used about 20 to 25 80lb. bags of sack-crete to fill it. While the concrete was still soupy I sank (4) three quarter inch  x 18" J-bolts matching the hole pattern in the tower 's base (to bolt the tower down to the concrete pad). I way overbuilt this compared to U.S. Tower's plans, but I live in a wind tunnel.


Hope this helps.


73


Mark K7OWG