Since the end of the Falklands War in 1982 there has been considerable speculation about the support and facilities provided by Chile to the UK. The publication of ‘The Official History of the Falklands Campaign’ by Sir Lawrence Freedman has at last shed fresh light of what actually happened.
Undoubtedly the most significant assistance provided by Chile, which can be confirmed with certainty, was in allowing a powerful radar to be sighted near the border with Argentina to give advance warning of Argentinean fighters taking off for sorties against the Task Force.
Certain previous histories of the Falklands Air War, noteably 'Sea Harrier over the Falklands' by Commander Sharkey Ward, have commented on how the RN Sea Harriers often had an uncanny ability to be in the right place at the right time when attacking Argentinean fighters arrived. We now know that it certainly wasn’t due to the telepathic ability of the brave, but rather self-serving and egotistical ‘Sharkey’ Ward, but was yet again down to the timely gathering and dissemination of accurate intelligence - in this case not by a USAF E-3A or USN E-2C, but by UK forces on the ground.
There's more on this topic here
http://www.spyflight.co.uk/chile.htm
Heimdall