Antenna length should be 1/4 or 1/2 of wavelength, so for 500KHz AM radio we need at least 125 antenna length. How does AM radio work? - Quora
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Find the minimum length of antenna used to transmit a radio signal of frequency of 30 MHz. - YouTube
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SOLVED:A certain type of radio antenna is called a quarterwavelength antenna, because its length is equal to onequarter of the wavelength to be received. If you were going to make such antennae
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