Over-the-horizon radar

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Notion

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Science and technology

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What Wikipedia says

Over-the-horizon radar (OTH), sometimes called beyond the horizon radar (BTH), is a type of radar system with the ability to detect targets at very long ranges, typically hundreds to thousands of kilometres, beyond the radar horizon, which is the distance limit for ordinary radar.

Excerpt from the Wikipedia article “Over-the-horizon radar”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: US Navy, Public domain, via Wikimedia Commons.