An adjustable mount for an antenna includes: a generally vertical pole; a plurality of rails mounted adjacent the pole's upper end, each of the rails including a cap with a mounting hole at its upper end; a mounting foundation having a base panel and a mounting platform positioned above the base panel, the base panel including a set of discontinuous slots extending at an oblique angle to a radius originating at a center point of the base panel; a plurality of threaded members inserted into the mounting hole of a respective one of the rails and one of the set of discontinuous slots to mount the mounting foundation above the upper end of the pole; and a plurality of nuts threaded onto a respective threaded member beneath the base panel. Rotation of the nut relative to the threaded member causes an overlying section of the base panel to move vertically.