US D478575 S1
FIG. 1 is a front perspective view of an antenna structure for a handheld electronic device according to the present invention;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof; and,
FIG. 6 is a rear elevational view thereof.
The broken line showing of the handheld electronic device is for illustrative purposes only and forms no part of the claimed design.