I am a Master Electrician with IBEW Local Union Number 305. Code is clear about this, but since you are not in the states. it is up to local authorities.
What is important is good path to earth for a lightning strike to drain off, Remember Its a very high power electrical charge, no matter what you use, when it gets hit it can become toast. But its lazy. Electricity will travel the easiest route. so if your Rod is a better path (less resistance) than the surrounding area, then it will follow that path. Your conductors likewise should be an easy path, large enough to deal with a high power transfer, at least a diameter as your finger as smaller wont last, this usually means Copper wire. as Gold is too costly, and Silver is not much better.
Steel is used for most grounding rods, they are only copper coated. the rods for lightning as well. Use 1/4 inch strapping 1/2 inch or wider should be a good connection point to the rod, larger is fine, but 1/8 is too thin to hold up to a strike.
For the record, when I mention lasting, it is not about years, its about lasting long enough to drain the lightning strike. its not any good if it melts at the first hit, before it can drain the electricity.