These FASC57U flexible antennas are made by ICOM and are just as reliable and tough. They are a perfect replacement or for use as a possible range extender.
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UHF portable helical antenna
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Frequency: 430 - 470 MHz
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Compatible with ICOM radios ICF4/F4S, ICF4GS/F4GT, ICF40GS/40GT, ICF43G/S/T, ICF43TR, ICF21/F21S, ICF4003, ICF24/F24S, ICF4013, ICF4021S/F4021T, ICF4161S/D/F4161T/D.