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This four-inch antenna could let you text from deep underground
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This four-inch antenna could let you text from deep underground
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12th April 2019, 11:24
| #1 |
| [M] Reviewer  Join Date: May 2010 Location: Romania
Posts: 153,575
 |  This four-inch antenna could let you text from deep underground There's a reason that scuba divers use sign language and that caves and tunnels create radio dead zones. The laws of physics prevent radio signals from penetrating materials like water, soil and stone, and that's been a frustrating limitation of mode... https://www.engadget.com/2019/04/12/...vlf-radiation/ |
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