The local power company put the power underground , took the pole and
left the guy line anchor for me to destroy the mower on. It was too
springey to beat into the ground with a sledgehammer, so after much
blood, sweat and beers and the use of a posthole digger, a large pipe
wrench with a cheater, I am now the owner of a 5' long heavily
galvanised screw (10" wide) in anchor with a forged loop on the top.
Perhaps your power company might have some they don't need anymore.