Blohm & Voss BV 138 MS minesweeping aircraft carrying magnetic field-generating degaussing equipment, including a hoop antenna.
https://diqn32j8nouaz.cloudfront.net...inesweeper.jpg
https://diqn32j8nouaz.cloudfront.net...nesweeper1.jpg
https://diqn32j8nouaz.cloudfront.net...nesweeper2.jpg
Previously:
https://www.homemadetools.net/forum/...621#post155452
https://www.homemadetools.net/forum/...227#post126500
https://www.homemadetools.net/forum/...2367#post76229
https://www.homemadetools.net/forum/...if-video-72544
