The ornamental design for antenna for wirelesstag, as shown and described.
1. Antenna for wireless tag
1.0 : Front surface view, the rear surface view being a mirror image thereof.
The portion illustrated with solid lines is the portion for which design registration is sought; the dashed lines shown in the drawing represent portions of the antenna for wireless tag that form no part of the claimed design; a back view is omitted because it is a mirror image of the front view.