The ornamental design for an antenna mount, as shown and described.
FIG. 1 is a left-front perspective view of the ornamental design for the antenna mount.
FIG. 2 is a right-rear perspective view of the ornamental design for the antenna mount.
FIG. 3 is a front view of the ornamental design for the antenna mount.
FIG. 4 is a rear view of the ornamental design for the antenna mount.
FIG. 5 is a left side view of the ornamental design for the antenna mount.
FIG. 6 is a right side view of the ornamental design for the antenna mount.
FIG. 7 is a top view of the ornamental design for the antenna mount; and,
FIG. 8 is a bottom view of the ornamental design for the antenna mount.
In these drawings, the features shown in broken lines depict boundary lines or environmental subject matter only and form no part of the claimed design.