I'm not exactly sure which unit you are hunting but it sounds like potentailly lots of snow somewhere in Western Colo? If so, antelope may migrate miles...they don't particularly like high elevation and deep snow? Access may also be an issue if there is much deep snow? Depending upon where you are some areas with snow can be nearly impossible to access when they get wet and gumbo mud! You may want to bring 4 sets of chains plus a shovel or 2?
Just like hunting any other game in fairly open country...use the topography to get closer...obviously keep the wind in mind. Antelope have about the best eyes of any big game animal and have great noses as well. Don't get in a rush when you find a buck you are interested in. Watch them from a distance...possibly for hours and hours until they make a mistake or offer a route to stalk to muzzy range. You may want a pair of knee and elbow pads if there is much cacti. If it's snowy I would definitely bring white camo.