Ernie will steer you in the right direction.
For me, when I hunt from an elevated treestand, I like to use a mono pod of some sort. I've had good results using a cut off broom handle (I have even used a cut off sappling when I forgot my monopod). The downside to this type of rest is stability at longer ranges. Typically, I use this monopod style for treestand hunting at short ranges.
For hunting from the ground, I like to use either a homemade tripod that allows me to adjust for height and also provides support for the grip as well, or a converted camera tripod that has a homemade top that allows good support for under the forend and grip. I've used this camera tripod out just past 300 yards successfully.
This is my homemade tripod. It's been slightly tweaked since this photo, but functionally remains the same.
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Camera tripod modified for shooting rest / field use. Here, I'm using it for some 303 yard practice with my 7mm RSAUM.
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