Back in the late 70's (dating myself again) a fellow in Iowa did a demo with a piece of #9 wire shaped as you said and drove it in the ground as a trap anchor for fox. I built some and they worked fine for coon and fox DRYLAND sets. Unfortunately the coyote arrival in those areas caused this anchoring devise to become ineffective and useless so it did not continued as a popular substitute for a stake. Water/mud anchoring it was not good for me so I stuck with the 2 rebar stakes on a slide wire back then.......... Now its Pogos, Iowa Disposables, Fangs, Berkshires, Bullets etc., etc., for stake replacements. Some of us use other materials but the premise of a "deadman" still holds (pun intended) our trap fastening thoughts. Where you live (north vs. south), type of fur harvesting devise, time of year that you trap, soil type and average moisture will dictate what you use to fasten a trap in place. Guys up north envy the light freezing conditions of the south, guys back east envy the dry soil conditions of the west, guys in the west envy the diverse rich habitat types of the east and guys down south envy the quality of fur in the north. The list of conditions and types of fur-harvesting situations goes on and on. I just try to be open to any "new" ideas here that seem reasonable to try to make the activity a little easier and more efficient to use. The twisted #9 wire trick that I saw/used worked for a specific time and place but went by the wayside as conditions/animal populations changed. My take-- the mike