The ornamental design for a wall mounted shower radio, as shown and described above.
FIG. 1 is a perspective view of an embodiment of the wall-mounted shower radio;
FIG. 2 is a bottom plan view of the shower radio of FIG. 1, a rear surface of the shower radio located at the bottom of the figure;
FIG. 3 is a top plan view of the shower radio of FIG. 1, the rear surface located at the top of the figure;
FIG. 4 is a left side elevation view of the shower radio of FIG. 1;
FIG. 5 is a front elevation view of the shower radio of FIG. 1, the rear elevation view not being shown as no ornamental features are disclosed there; and,