This set of models represents the AN/SRA-33 paired-cone "Phasor 90" antennas found on many Vietnam War-era US Navy warships including ships of the modernized Essex class (e.g. USS Intrepid CVS-11), Forrestal and Kitty Hawk classes (USS Kitty Hawk CVA-63 and USS Constellation CVA-64) as well as USS Enterprise CVAN-65, USS John F. Kennedy CVA-67, and USS Nimitz CVN-68.