What state are you in? You might want to check if pit blinds are legal where your at....in MI they are not.
http://www.michigan.gov/documents/Wcao_134367_7.html
Chapter II[/b]
General Hunting and Trapping Regulations[/b]
**Section 2.1 takes effect on March 6, 2009, and will remain in effect until March 6, 2012**[/b]
2.1 Taking of animals; prohibited methods, devices, and weapons; exceptions.[/b]
Sec. 2.1 Unless otherwise specified in this order, a person shall not do any of the following:
(1) Make use of a pit, pitfall, deadfall, scaffold, raised platform, tree, cage, snare, trap, net, baited hook, or similar device, or a drug, poison, anti-coagulant, smoke, gas, explosive, weasel, ferret, fitchew, arbalest, spear, or mechanical device, for the purpose of taking an animal or driving an animal out of their hole or home. For the purpose of this order, a mechanical device shall not be construed to mean a firearm, crossbow, slingshot, or bow and arrow. When used in this order, "raised platform" means a horizontal surface constructed or manufactured by a person that increases the field of vision of a person using the horizontal surface beyond the field of vision that would normally be attained by that person standing on the ground.
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Sec. 2.8 A person may hunt with a bow and arrow from a scaffold, raised platform, or tree. A person taking deer or bear with a firearm may use a scaffold, raised platform, or tree. A person taking fox or coyote with a firearm one-half hour before sunrise to one-half hour after sunset may use a scaffold, raised platform, or tree, pursuant to all other hunting regulations. In taking an animal, a person shall not do any of the following on publicly owned lands: