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Here are 3 YouTube videos that nicely present the installation of a ham radio antenna radial system that is equally well suited to part 15 AM antennas.
It shows using a DX Engineering ground radial plate with wire lugs and bolts. That’s a very neat way to attach the wires, but a heavy copper wire ring with the radial wires soldered to it, like discussed above, should be equally suitable.
He is using inexpensive 20 gauge PVC insulated wire for the radials. The video illustrates the common practice of first mowing the lawn short and then stretching the radials out tightly on top of the earth and using landscape pins to hold them down. After a few growth cycles, the grass will pull the wires down into the roots and the wires disappear.