Coming out of the radio shack is a piece of 3/4″ copper pipe bent into an S for a radio-frequency (RF) ground. Also coming out is a chunk of #6 multi-strand serving as chassis and 120v ground.
The ground wire itself is mostly #6 multi-stranded copper wire running a continuous 160-foot loop. At every turn, there are scraps of 3/4″ or 1/2″ copper pipe pounded two feet or so deep until stopped by rocks.