DocumentRelease Date: 2017-09-13 Document Date: 2005-02-24
The U.S. closed a number of High Frequency Direction-Finding sensor sites in the 1990s. To ensure they're able to track signals in areas that had previously been covered by now-shuttered stations, the Signals Intelligence Directorate worked with Second and Third Party partners to share resources and establish a global direction-finding network.
DYNAMIC PAGE - HIGHEST POSSIBLE CLASSIFICATION IS TCP SECRET // SI / TK // REL TO USA AUS CAN GBR NZL (C) CROSSHAIR — Foreign Partners Filling HF/DF Gaps for the US FROM: Corporai^H^Smlce...
Australia (AUS/AU), Austria (AUT/AT), Canada (CAN/CA), Denmark (DNK/DK), Ethiopia (ETH/ET), Hungary (HUN/HU), India (IND/IN), Israel (ISR/IL), Italy (ITA/IT), Japan (JPN/JP), Jordan (JOR/JO), Korea (KOR/KR), Netherlands (NLD/NL), New Zealand (NZL/NZ), Norway (NOR/NO), Pakistan (PAK/PK), Saudi Arabia (SAU/SA), Sweden (SWE/SE), Taiwan (TWN/TW), United States (USA/US)