Practice extreme ranges. I like to shoot 100+ yards in practice. This makes my personal limit of 60 yards on game much easier for me. I know a couple guys that actually practice to 120 yards and limit themselves to 80 yards. Also spend time practicing with a side wind at longer ranges.
I have taken three antelope from a blind- all inside of 30 yards. I have only taken one while stalking and that shot was 56 yards. If you have a chance at a water hole set, I recommend it. Water holes usually produce more high percentage opportunities. I use a 5 pin spot hog for hunting. For long range I recommend using very small pins so they don't obscure your target.
On a side note I really like expandable broadheads for antelope. IMO they don't drift as bad in the wind but it may all be in my head?