Shakespeare Upper Antenna Bracket The Shakespeare Upper Antenna Bracket is a support and insulator bracket for use with 1-12 antennas. Can be used with 407 Swivel mounts sold separately. When installing a marine antenna, its important to install as high as feasible, and as free as possible from obstructions. Features Includes 1 reducing adapter Includes 1-18 reducing adapter Corrosion resistant Easy-open for quick laydown How to Install Shakespeare 408-R Upper Antenna Bracket You will need Drill