Our ROSA-HDM1 is a die-cast aluminum mounting bracket for omni-directional stick antennas. This bracket is heavy-duty and made for outdoor use in order to offer a long service life. Appropriate for wall or mast mounting of plastic or fiberglass antennas up to 1.4 inches in diameter & up to 70 inches long. Will attach to any wall, or any mast from 2" to 2.5" diameter.