Not only are the companies that are selling the ANT7511 using the image of the original ANT751, but the box for the ANT7511 has images of the original ANT751. The worker that pasted the ANT7511 sticker on the box, put it on at an angle, so that it is possible to see the printing ANT752Z.
My guess it that first RCA wanted a smaller box, so they made the boom in two pieces. Then, they said why stop there, let's see what we can remove to cut costs even more, so the ANT7511 was born......Ugh!