The ornamental design for a multi-element antenna, as shown and described.
FIG. 1 is a top perspective view of an alternative embodiment of a multi-element antenna, and the numerals 1-3 form no part of the claimed design but serve as reference points for FIGS. 2-8.
FIG. 2 is a bottom plan view of the multi-element antenna of FIG. 1.
FIG. 3 is side view from a 1-2 corner of the multi-element antenna of FIG. 1.
FIG. 4 is side view from a 2-3 corner of the multi-element antenna of FIG. 1.
FIG. 5 is a side view from a side 1 of the multi-element antenna of FIG. 1.
FIG. 6 is a side view from a side 2 of the multi-element antenna of FIG. 1.
FIG. 7 is a side view from a side 3 of the multi-element antenna of FIG. 1; and,
FIG. 8 is a side view from a side between 3 and 1 of the multi-element antenna of FIG. 1.
The broken line showing is for illustrative purposes only and forms no part of the claimed design.