Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. High frequency direction finding, usually known by its abbreviation HF/DF (nicknamed huff-duff, pronounced "aitch eff dee eff") is the common name for a type of radio direction finding employed especially during the two World Wars.

Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.