The ornamental design for an antenna, as shown and described.
FIG. 1 is top plan view of an antenna showing our new design;
FIG. 2 is a side elevation view thereof;
FIG. 3 is an enlarged view of circle 3 of FIG. 2;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is an exploded view thereof;
FIG. 6 is an isolated top plan view of a first and second antenna element shown separately for clarity of disclosure, thereof; and,
FIG. 7 is an isolated top plan view of a third and fourth antenna element shown separately for clarity of disclosure, thereof.
For clarity of disclosure, the claim is directed to the overall ornamental appearance of the antenna in its entirety and does not extend to the ornamental appearance of each of the individual components in isolation.
The dash-dash broken lines illustrate portions of the antenna that form no part of the claimed design. The dash-dot-dot broken lines illustrate the boundaries of the sectional views and form no part of the claimed design.