I've never had sagey game, but as has been stated, marinades can do alot. Try an ovenight soak in 7 up or Sprite (good for any meat). Apple juice is a good marinade as well.

I've never had a bad antelope so....on the soap box:
1. Stalk and shoot, don't run them
2. Field dress immeadiatly.
3. Don't drag the thing across miles of terrain. If you have to take it aways to a vehicle, put it on a pack frame and carry it.
4. Get it skinned and on ice ASAP. A couple of bags in the body cavity or skin and quarter and pack in ice in coolers.
5. If can do, I get them in the freezer the day they are shot...or the next morning if an evening kill.

Can't always do all of the above, but can always--if prepared--at least get the meat on ice within an hour or so of the kill.

Okay, I'll get off the soap box.