This is a large band used for maritime communications in USB, with 4125 kHz being used as a calling/distress frequency. (note: SAR agencies are switching over to DCS distress signaling for the HF and VHF marine bands. The 4 MHz marine band DCS frequency is 4207.5 kHz.) The United States Navy’s Virginia Capes radio station can be heard on the frequency of 4372 kHz using the callsign “GAINTKILLER”.
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