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Amazon.com: CynKen 5pcs 10x140mm Ferrite Rod Bar Loopstick for Radio Antenna Aerial Crystal About 0.4"x5.5" : Electronics
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Figure 6 from A High Efficiency Twin Coil Ferrite Rod Antenna for RF Energy Harvesting in AM Band | Semantic Scholar
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5PCS antenna magnetic bar Radio ferrite antenna magnetic bar diameter length with coil magnetic bar - AliExpress
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