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===Longwave receiving antennas=== [[Image:Low cost DCF77 receiver.jpg|thumb|Low cost LF [[time signal]] [[Radio receiver design|''crystal receiver'']] using ferrite [[loop antenna]].]] Antenna requirements for LF reception are much more modest than for transmission. Although non-resonant long wire antennas are sometimes used, ferrite [[loop antenna]]s are far more popular because of their small size. Amateur radio operators have achieved good LF reception using [[active antenna]]s: A short whip with a built-in [[pre-amplifier]].
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