Standard grounding for lightning protection of commercial radio and broadcast sites include a ground ring around the perimeter of the building and lots of ground rods spaced at specific intervals around the ring. This places a reliable ground connection at every possible entry point to the building and lowers the resistance of the ground system.
The idea is to dissipate as much lightning energy into the earth and to minimize levels on cables entering the building. The AC power ground must be well bonded to the ring to keep AC power and antenna/signal ground potentials close during a strike. Even with an effective ground at the antenna, there can be thousands of volts of potential between the AC power neutral and antenna system during a strike which can destroy lots of equipment. A single point ground for AC power entry and antennas is ideal for best protection but not practical in some instances.
The ground ring is usually 500MCM bare stranded wire and ground rod connections are cad welded. Mountain top repeater sites in my area withstand direct lightning hits all the time with no damage but this level of protection is usually not possible in a residential situation. The advice of disconnecting your antenna during a lightning storm may be the only way to protect your radio equipment for most residential systems.
Effective lightning protection is probably not practical for most residential situations, commercial radio sites are designed from the ground up (pun intended) and you cannot assume you are protected just because you have an extra ground rod or two somewhere and a lightning protector on your coax. Its better to disconnect the antenna and unplug expensive equipment than to find out your lightning protection didn't work.
I wouldn't bother with the loop around your house--it sounds like overkill. If you've already buried it, then I would say just attach it to your ground rods, and you'll have a ground system vastly superior to 99% of all hams.
Actually, it's a bad idea to do that. You could end up with a nice charge building up on anything inside that loop.
If you have to drive extra ground rods to avoid that kind of loop, just drive the extra rods. Or bury a nice big metal plate a few feet down. But don't loop a ground around the house.