I've only ever used one mojo (motorized). I might get another this season and do some experiments.

However, last season I went on an afternoon hunt. Had the dog and the gf's 12 year old daughter with me. When we got there, my gf's dad was there and had setup two wind powered decoys somewhat close to one another. So, we joined him, it was pretty windy and the hunting was slow. When the birds started to move a few would come to the decoys but not like I wanted them to. After awhile I got restless and decided to put my mojo out about 5 feet to the left of the wind powered birds. The birds would come into the group of the three decoys but when they got close they'd all veer off to the motorized one.

what do you use to elevate them from the ground

The mojos should come with poles.

They sure do. These live action kits will elevate them even higher.
http://www.tbicatalog.com/TBICatalog2/decoys/mojo_accessories/mojo_live_action_kit.html

Has anyone used the action extensions for the mojo dove or duck? I came close to pulling the trigger on the duck one, but I read a lot of reviews that said it sucks. Basically, the decoy would swivel around to one side (down hill) and just sit there. It didn't give the extra movement at all.

Can anyone confirm or dispute it?

I took a piece of square stock and made an extension for my Mojo Dove. It sits about 3.5 feet off the ground now and I place a half dozen of the foam decoys on the ground around it. I just received my Cabela's Great Outdoor Days Flyer in the mail and sure enough there is the price $29.99. I bought my Mojos at WalMart two years ago for $18 bucks a pop. I'll post a pic if anyone is interested in the extension pole.

I've made extention poles out of pvc and a reality sign pole. They seemed to work better with the stock pole.

Nice to see this topic took off. Haven't been here the past couple of days, had to have a little bit of oral surgery and haven't been up to par lately.