I use an 18" piece of PVC with 2 pieces of rope attached to it. One piece in the middle of the PVC, the other on one end of the PVC.
Drill a hole directly behind your shack.
Drop in the PVC. It sinks. Snug it up against the bottom of the ice with the middle rope and attach it to your shack (I have modified the end of my rope to attach to my shack with quick release buckles, one end of the buckle permanently mounted to the shack).
When you're done for the day, lower the PVC bak into the water a few inches and pull on the rope attached to the end. It comes up end first.
Works great in all conditions and takes about 60 seconds to install once you're out there. No more messing around with spikes, having to screw them into the ice, etc.
I actually have two of them if the wind's really going one for each back corner. I rarely need to use the second one.