Yes the current ground rod looks like a piece of rebar that was placed in the ground when the pad was poured. I have no idea how deep it goes. The grounds attached to it go in a couple directions and look like about 10 guage copper that go directly into the ground and possibly around. I have not investigated to much this day as I was on a time crunch. I will look further in the next couple weeks.
This is not owned or operated by a cell company they are only a tenant. I will try and dig up more from the owners of the tower maybe some old as builts or something.