Do you have a general area of which part of wyoming you want to hunt. Here in the North East around Gillette, Wright, Newcastle so on there are the national grasslands with alot of public lands and a ton of antelope. They are not as big as the antelope down in the mid south part of the state but large ones can be found here. Look around area 27 I believe and the surrounding areas for a starting place. Get the forest service map of the Thunder Basin National Grasslands and you will be good to go.