I have not bought a true antelope decoy. But I have a small deer 3d target that I have painted to look like an antelope, with the whte on the and rump, with the black patch on the cheeks. Let me tel you, here in Idaho we have had many antelope come running at this decoy. I archery hunt for antelope and this is challenging due to the shot distance. But I will never buy a decoy for antelope and will always use this painted up target.
I have tried to use white flags but the antelope tend to run when using them, so i am not a fan.
Tried a true antelope decoy for the first time last weekend. My brother is the archer, not I , but I am a good decoy holder. We had a couple of decent bucks interested, but could not get them within 100 yards. The white t-shirt thing just happened to be possible as well, as I was wearing one the second day we went out. It didnt work so well either, but that is not to say it wont. It is really early for rutting goats yet, so the best days are to come with the decoy. ALL the horned goats we saw were alone or with other bucks, only one with any doe. When they start ruttin' up, watch out. You will have to throw that decoy to the side before too long. I have heard when a herd buck comes runnin, that or an arrow may be the only way to turn him around.
When it comes to scent, there are basically two types; those that attract and those that mask. I've tried both on many occasions. There are lots and lots of "doe in heat" scents, designed to attract a big buck into range. I've also used a "cow in heat" scent while elk hunting.
Another scent would almost be better named as a "coverup smell". The main goal is to cover up human odor or mask it. Though I don't believe you can ever totally eliminate all human...