D. Lilly & Co.
Adjustable Antenna Rail Mount
adjustable rail mount is made from high grade stainless steel. The mount
is to fit rail sizes 1 1/4" & 1 1/2". The mouting thread
1" inch is great for VHF & GPS antennas. The mount adjusts very
easily with a few turns of the screw. The adjustable feature is great for
lowering antennas in tight waterways or low clearance bridges.