I claim the ornamental design for an antler display device with a square base, as shown and described.
FIG. 1 is a left front perspective view of an antler display device with a square base.
FIG. 2 is a top view thereof.
FIG. 3 is a front elevational view thereof. The dotted line portion showing an upper surface is for illustrative purposes only and forms no part of the claimed design.
FIG. 4 is a rear elevational view thereof. The dotted line portion showing an upper surface is for illustrative purposes only and forms no part of the claimed design.
FIG. 5 is a right-side elevational view thereof. The dotted line portion showing an upper surface is for illustrative purposes only and forms no part of the claimed design.
FIG. 6 is a left-side elevation view thereof. The dotted line portion showing an upper surface is for illustrative purposes only and forms no part of the claimed design; and,
FIG. 7 is a front view thereof. The dotted line portions showing a pair of antlers and an upper surface are for illustrative purposes only and form no part of the claimed design.