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A satellite dish or dome mounted on a sloped section of roof won't sit level, and that throws off tracking and signal. Winegard's RW-2000 roof edge wedge corrects for that slope, giving compatible antenna mounts the flat base they're designed for.
It's built specifically for roofs with a slanted edge, so check your existing antenna's part number against the compatibility list before you order, this is a fit-specific piece, not a universal one.
Get your antenna sitting level again so it can actually find and hold a signal.