Hi
This is my decoy setup and it's working like a charm . The movement created by the spring does the magic. It creates a life like simulation and only needs a small breeze off wind . The ones that are doing fly overs will drop like a sack of potatoes once they notice movement. I have not tried this setup on ferral pigeons however the rock pigeons are suckers for this . To me this works perfect when shooting in confined and risky situations .This gives you peace of mind as you can set it up where you are satisfied with regards to safety , proper backstop etc .
https://gunstreamer.com/watch/vid-20190319-183248-mp4_SFMuXcdrYDAZZR4.html?jwsource=cl