The ornamental design for antennae for lap desks, as shown and described.
FIG. 1 is a front, elevated, right-quartering perspective view of the new design for antennae for lap desks;
FIG. 2 is a top plan view of the design shown in FIG. 1;
FIG. 3 is a bottom plan view of the design shown in FIG. 1;
FIG. 4 is a rear elevational view of the right half (as viewed in FIG. 2), shown relative to axis A, of the embodiment of the design shown in FIG. 1, the rear elevational view of the left half thereof being the mirror image of FIG. 4; and,
FIG. 5 is a right side elevational view of the design shown in FIG. 1, the left side elevational view being the mirror image of FIG. 5.