I hunted a few days after the rifle opener in unit 72 last season, which is just South of 73. I am sure the antelope numbers are for the most part the same near highway 20-26, whether you are on the 72 side or the 73 side. Guys that have hunted that area say numbers seem to be down when compared to years past. But you wont know the difference if its your first time in the area like it was mine. I still saw plenty of antelope. I glassed an area in 72 and could see decent sized groups of antelope with good sized bucks across the highway in 73 near Powder River. Don't stress too much about the hunt ahead of time like I did, you will see antelope and it should be a lot of fun. It may take a little more time finding a larger buck then in years before the big winter, but if you lay off the trigger, you will run across a few shooters.