Could anyone please tell me what the white wire in the photo is for please.

Could anyone please tell me what the white wire in the photo is for please.

Nice Drip Loop!
What drip loop!!!
Looks like a lightning arrestor mounted to the service mast.
I question this installation’s legality. Maybe this is a common method in your area.
Thanks speedy, and no it is not common
lol…guess they did not want to put it at the panel…lol