A collapsible mounting frame (10) for a basketball backboard (12) has a pair of frame portions (20, 22) adapted for mounting on the sloping roof (16) of a building. Each frame portion (20, 22) has a base member (24), a vertical member (26) connected by a hinge (30) to the base member (24), and a diagonal member (28) connected by hinges (30) to the base member (24) and the vertical member (26). The diagonal member (28) includes a pair of diagonal portions (28A, 28B) adjustably connected to each other to adapt the frame (10) for mounting on roofs (16) having varying slopes.
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