said by bburley:
The manual for a DMX-68 wants 4 cubic feet of concrete. Your tower is smaller, but it also has to tilt over. My uneducated guess is that the same amount of concrete should work for you.
Perhaps you mean yards...??
I also met someone who was concerned about concrete + lightning. He said that a direct hit could split the concrete and his solution was a rubber insulator around the concrete and a separate ground rod. At only 30 feet, I don't know if that is a concern.
This demonstrates a complete lack of understanding of the issues involved (not you...the other person).
The base needs a spot-welded rebar cage with a tail for a bonding jumper to the tower/grounding system.--
Nothing makes an American want to do something more than telling them they can't.