The ornamental design for an antennaornament, as shown and described.
FIG. 1 is a perspective view of an antenna ornament in full lines with a
car shown in broken lines representing environmental association matter
being for illustrative purposes only and forming no part of the claimed
invention;
FIG. 2 is a front elevational view of the antenna ornament, the rear
elevational view being a mirror image of the front view;
FIG. 3 is a left side elevational view thereof, the right side elevational
view being a mirror image of the left side elevational view;