we are currently constructing a cell tower site. we are installing the ground ring and need to take ohms reading for close out package my requirements require me to get less than 5 ohms when testing, The master ground bar ties directly to building steel and the rest of the equipment ties to Master ground bar. I get 2-3 ohms at Building steel connection. i get 12-14 ohms at Master ground barconnection from Building steel, but i get 2-3 ohms from to master ground bar to each piece of equipment. do you guys have any experience with this type work? why would i get 12-14 ohms at master ground bar ground coming from building steel but get lower ohms reading at equipment and building steel connections. why wouldnt i get less than 5 ohms at master ground bar. what do you guys think im missing??