For unpressured birds, you can just set up your blind w/a couple of dekes in the middle of the field and have success.
I hunt a highly pressured bowhunting only zone. Consistantly successful hunting tactics are quite different here. These birds become educated quickly and run from the site of a blind, even partially concealed and/or dekes. We set-up where the birds want to be in the 1st place. My trad partners and I may spend up to an hour getting a set-up ready to achieve virtually total natural concealment. This practise has increased our shot opportunities by 3X.
Call extremely sparingly and consider using calls that the birds haven't learned to associate with a hunter. My choices are trumpets or wingbones. The one problem I have encountered using this style call is that on least a 1/2 dozen occassions that I had inexperienced hunters actually hunting me.
We also use with much success, dummy blinds and dekes to move birds toward our concealed set-ups.
This tactic could back fire, however these birds are so pressured that they have so far gone out of there way to avoid the dummy set-up 100% of the time.
I am no expert but Turkeys are my thing and going this extra mile has paid worthwhile dividends.