Trapping pigeons

[USMC03]

How would you recommend trapping these feathery little cespools?  I googled this topic and found some ideas but they looked pretty rickety and some that looked to come out of a roadrunner and wiley-e-coyote cartoon (the stick holding up the box with a string attatched). I want one that I can leave for 24 hours or so and check the next day.

[GRIZ]

I have never tried trapping them. What I have done is just climb up and get them at night. You find thier roost and you just grab them, they don't fly away but will walk away if thery have a way. It's not unheard of to get a couple hundred in a night with good places.