They did come out of boats owned by the state(N.C.). The state have a lot of boats used in the intercoastal waters and the ocean as well as the rivers. They operated ferrys for transporting cars/people to the outer islands and boats used for commercial fishing enforcement. They also have research vessels.
Bear if you want a fun radar to play with at home go to the big outdoors stores and you might be surprised what you can get for not a lot of money.
I also got an antenna that was about 4 feet long. It was made of Al and figerglass. On the inside of the fiberglass front it looks like gold plated metal.
Here is the Al antenna with the front removed.
Here is the inside face of the front panel.
A close up of the inside of the front panel.
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