Hi-Q makes some marine screwdriver type antennas. They have excellent ratings on eHam.net and are some are made for US Navy Ships and submarines. The price indicates they're pretty proud of them too. I know some guys that use Yaesu ATAS antennas mobile in coastal Louisiana with zero problems from sea air. It's not quite the same as on the water, but these antennas are more durable than some here imply.