It's not magic. It's just a long wire, but it does what it's supposed to. I would give it five stars but my finger slips out of the groove as I wind the wire back onto the spool. A long wire increases the power of shortwave signals. If the radio has bad filters, it also causes more local interference and can degrade the sound of the stations. You can get the same effect by connecting a long cable to the antenna. The built-in spool neatly packs the wire into a compact space, so it was worth it.
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