This 3-piece system consists of a base, and two brackets - one for when the antenna is deployed, and one for when the antenna is stowed.
The antenna base/bottom swivel mount has a stud going through it. One inch Morad antennas and antenna extensions have a hole drilled through the bottom to enable passage for the stud. The base swivels to provide double swivel action for deck or bulkhead mounting.
Upper bulkhead standoff, with latch bar, for easy one-hand removal and lay-down of antenna
Upper J hook holds antenna when it is laid down for stowage
Mounting hole spacing for bottom and upper mounts: 3-3/8" center-to-center
For 1" diameter base tubes