A lot depends upon the state, time of year, terrain, how many water sources are available, hunting pressure, rut, etc. There are a lot factors involved. I would expect a cow decoy may work if there are cows in the area you'll be hunting. If not, they will likely run the opposite direction! I've seen on a TV show where a guide had 2 horses. A bow hunter hid behind one of the horses as they meandered closer and closer to an antelope buck. With a lot of patience he actually got the buck they were after. I'm sure the antelope were already used to seeing cows and horses in that pasture. If there is a long stretch of hot, dry weather and few water sources in the area waterhole hunting may be pretty easy. If it's wet, lots of water, and antelope aren't given time to acclimate to a blind it may be pretty tough. Decoys may work like a charm if you are lucky and hit the right buck during the rut. If they aren't rutting or you are hunting super open country you may strike out. Like I said, there are lots of factors for success or failure!