Will last 2 years and then the buried cable will rust and break away from duckbill,
I've used duckbill earth anchors twice to secure an aluminum awning from wind loads and while they are easy to install, in both instances they rusted where the cable attaches to the duckbill earth anchor, after 2-3 years. Problem is you dont know when the cable is totally compromised until one day you lean on it and it comes out of the ground. These are only good for temporary support of structures. The cables rust very quickly when in the soil.
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