I claim the ornamental design for a waterfowl call decorative band, as shown and described.
FIG. 1 is a perspective view of a waterfowl call decorative band, showing my new design;
FIG. 2 is an enlarged perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a right-side elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a left-side elevational view thereof; and,
FIG. 7 is a top plan view thereof, the bottom plan view being a mirror image thereof.
The broken lines showing a waterfowl call in FIG. 1 and decorative features in FIGS. 1-6 depict environmental matter and form no part of the claimed design.