I have been using shooting sticks for quite a few years and wouldn't go callin with out em.
I do not care for bipods even a little bit, they are unwieldy on a movin critter, keep your barrel stuck up in the air like a wart on your rearendus ,and weigh your gun down to boot.
The ones I use are simply two hard wood dowels approx 32" long and drilled about 6" from the top with a small bolt through them both.
A couple of things I have done to them are. 1, wrapped them in burlap strips to camo them and also to reduce gun clatter when I stick my rifle on em. 2, I have stuck little rubber tips found at any hardware store on the bottom tips to reduce rock clatter when bring them into position.
3. I lay them down over my left leg when calling so they are not visible till needed.
And 4, they make pretty good pokers to ward off the odd bunch of Javelinas that come spoiling for a fight to your call, as happened recently at the Williams Az Contest!