The Type 997 radar aerial at the top of the mainmast onboard Type 23 frigate HMS Argyll fitted at the end of 2013. Based in Plymouth, HMS Argyll is the longest-serving Type 23 frigate in the Royal Navy. Built in the late 1980s at the Yarrow Yard in Scotstoun on the Clyde (today part of BAE Systems), she was commissioned in 1991. Following an extensive £20 million refit in Rosyth during 2009 to 2010, HMS Argyll has now emerged as one of the most up-to-date and capable frigates in the Fleet, with her structure preserved and her weapons and sensors significantly enhanced. *Organization: Royal Navy *Object Name: DMC-14-018-007 *Category: MOD *Supplemental Categories: Equipment, Ships, Frigates, Type 23 *Keywords: Royal Navy, Equipment, Ship, Frigate, FFG, Type 23, Duke Class, HMS Argyll, Radar, Aerial, Sensor, Type 997 *Country: UK