ibeams? skyscraper grounds?
 

so how do the pro's do it??
hate to show my ignorance, but are the ibeams really 'ground'?

One of the BEST POSSIBLE grounds uses rebar in buried concrete;
Google for "ufer ground" and read to your heart's content.

When I had a basement built beneath my house, I installed a Ufer
ground in the footing around about half of its perimeter.

--
--Myron A. Calhoun; 2001 Dunbar Road; Manhattan, KS 66502-3907
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
NRA Life Member and Rifle, Pistol, & Home Firearm Safety Certified Instructor
Certified Instructor for the Kansas Concealed-Carry Handgun license