My brother built something like you are talking about. It has brackets and a platform to set your tent on top of it. It's a sweet set up. He set it up for gun hunting but you could do it for bow too since he put it like 12 feet in the air.
Here's the link for the brackets:
http://www.basspro.com/webapp/wcs/st...007000_400-7-4
You could put it 5-6 feet high like you are talking about.
Hope this helps!