Monday, December 12, 2016

electromagnetism - Why are longwave radio towers so tall?


They are often in the hundred meters high. See the wiki link:


https://en.wikipedia.org/wiki/Longwave


Why are they so tall? Because the wavelength is long, so the antenna should also be long? But to transmit in the longwave region, we only need to make the circuit oscillate in the right frequency, right? It has nothing to do with the size of the antenna, right?




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