The added benefit is that the lower you can go into the earth, the better the grounding protection against lightning strikes. Also if the tower is to be self-supporting (no guy wires) most of the literature I've seen talks about putting the base into a cubic yard (3x3x3 foot) pit for a 20 footer, with another cubic yard of concrete for every 20 feet of height, so that's pretty close to your suggestion. If you can rig guy wires to the mast instead, that will prevent having to dig such a big pit. When in doubt, ask the Nutech folks or check out a local HAM radio club to see what experiences those folks have with their heavy rigs.Crispy said:just either bury a few feet of the tower in the ground with a couple bags of cement or buy the triangle mounting plate and bury it.
I was looking at a 60 foot self supporting tower for my house amid the huge trees here and the literature called for AT LEAST 3 cubic yards of concrete, so I would have had to actually buy more than 60 feet of tower to include what needed to be below ground/concrete.