Progress at the Hilliard Darby Site Posted on July 21, 2015 by Webmaster These pads are 4″ thick and will hold the buildings that will house the electronics. The final grad has been completed at the site. The buildings are supposed to be delivered next week. This base is 42 feet deep and 40 yards of concrete. This will hold the 195′ tall tower. This base is 42 feet deep and 40 yards of concrete. This will hold the 195′ tall tower.