In Montana you can get a guaranteed archery tag, you still have to apply but you are guaranteed to draw, the tag is good statewide also for any antelope. I went last year in september and was into antelope every day, just couldn't close the deal, closest I got was 50 yards but needed 40 for my comfort level.
I used the mel-dutton decoy and the lohman challenge call. I did get a reponse from the call one day. I had a herd of antelope about 200 yards away and I was on top of a ridge, I put up my decoy and blew on the call and a buck blew right back at me! This went on for about a minute then he gathered up his does and took off. Lots of fun. I hunted public land and never saw another hunter