The ornamental design for a rotarydevice for communicationantenna, as shown.
FIG. 1 is a top, front, and right side perspective view of a rotary device for communication antenna;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines in the drawings are for the purpose of illustrating portions of the rotary device for communication antenna that form no part of the claimed design.