These are actually utility pole anchors. We through ton of used ones away in the dumpster every year and I have put thousands of them down by hand with an 8 ft digger bar and a sledge hammer. If you know somebody that works for a power company they may be able to hook you up.
The easiest way to install one is to dig a hole as deep as you can with post hole diggers then drop the anchor in and turn it in with the digger bar. It will go much faster and easier if you have a buddy smack the head of the anchor down with a sledge while you turn it in. And by the way, an 8" head with a 4' shank would hold the queen mary.
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[b]The Moose is Loose !
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