I use a pittman owl call but it is so old that I think they no longer make it. It allows me to mimic several different owl calls.....and they all work.

They work so good that last year my buddy standing next to me got buzzed by an owl!

Note it is not the pittman 806!

The Primos Hoot Flute is close to what I use. Allows you to move your fingers which helps in changing the notes of the owl call

JW