KC4USV McMurdo station Ross Island. From DXNews.com

Mark, W5MED will be active as KC4USV from McMurdo Station, Ross Island, IOTA AN – 011, until October 2021.
He will operate on HF Bands in his spare time.
Recent DX Spots KC4USV QSL via K7MT, LOTW.
Ads for direct QSL:
WILLIAM ERHARDT, 2851 FESTIVAL, HELENA, MT, 59602, USA.

KC4USV. Where is McMurdo Station located. Map.