The ornamental design for an antenna mount, as shown and described.
FIG. 1 is a front, top perspective view of an antenna mount;
FIG. 2 is a back, bottom perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a left-side view thereof;
FIG. 6 is a right-side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof; and,
FIG. 9 is a front, top perspective view showing unclaimed environment of the antenna mount according to the claimed design.
The dashed lines depict portions of the antenna mount that form no part of the claimed design, and/or show environment of the antenna mount that form no part of the claimed design.