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My understanding of the generic NEC requirements for this type of grounding conductor is that at least 20 feet of steel needs to be encased in at least 2 inches of concrete, close to the area where the concrete and soil meet. The bonding conductor between the electrical service and UFER ground is supposed to be #4 AWG. Also, the code requires that all other grounding rods, buried pipe, etc. must be bonded together, to form a single contiguous system. These bonding conductors are generally required to be #6 AWG.
So, Im uncertain if there is enough steel in your tower foundation to qualify it as a UFER ground capable of serving as your sole electrical service ground. I'm inclined to think that if bonded to your electrical service, it would very likely provide a superior connection to earth as compared to a a typical driven rod.
As always, a connection to earth is only one element in the grounding / bonding system. Solid, reliable bonds and grounding conductors that are capable of handling fault current loads are vital to preventing dangerous voltage differences between grounded objects.
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