{"version":"1.0","type":"link","title":"High-frequency direction finding - Newikis","description":"High-frequency direction finding, usually known by its abbreviation HF/DF or nickname huff-duff, is a type of radio direction finder (RDF) introduced in World War II. High frequency (HF) refers to a radio band that can effectively communicate over long distances; for example, between U-boats and…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400,"thumbnail_url":"https://thumb.wikimedia.org/wikipedia/commons/thumb/a/a7/HMS_Belfast_-_Huff_Duff.jpg/1280px-HMS_Belfast_-_Huff_Duff.jpg","thumbnail_width":1280,"thumbnail_height":1475}