The ornamental design for a repeater for communications apparatus, as shown and described.
FIG. 1 is a bottom, front and right side perspective view of a repeater for communications apparatus showing my new design;
FIG. 2 is a top, rear and left side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines in the drawings are for the purpose of illustrating portions of the repeater for communications apparatus that form no part of the claimed design.