Firstly, a charged area reaches up from the ground and then a stroke may form from the sky.
A tower is more likely to be struck by a stroke grounded or not.
To prevent a stroke at a point that has a charged area, disapators are used.
A disapator is made up of many hair like threads of stainless steel that is connected to a bonded halo ground system at roof top level of a building or tower.
Another form of a disapator is a tower structure that has an umbrella shape device at the top and what appears to be barbed wire in a cloaking cover. The greater the surface area of disapators the more readily the earth charge is conducted skyward preventing a stroke.
A single earth driven ground rod is of no benefit in parts of the SE USA. A chemical well is drilled deep into the ground and consists of a perferated copper pipe about 4" in dia. and 35' long this is filled with salts, not salt.
Often used at commercial tower sites in Florida. To improve grounding a "Single Point Grounding System" is used. To improve that single point ground five or ten 10' ground rods are driven 10' apart and running away from the tower, all are bonded with 2" wide copper strap buried in the ground.
I could just go on for hours but won't bore you any longer