Reads to me like they are in Argentina. South Sandwich is way up there on the Most Wanted List. If they were there it would be a huge DX affair.
From QRZ website for LR5U
Special event callsign (only December/2005) for LU1UG Radio Club Pampeano of General Pico, La Pampa province. In conmemoration of the 50th. anniversary of the first ever ham radio operation from Thule Island on South Sandwich Islands Group- LU3ZY operated from Thule for the first time on December 14th. 1955. More details please visit GACW home page on http://gacw.no-ip.org
Bio last modified: 2005-12-09