Most stations heard in this range are aeronautical and marine navigation beacons that continuously repeat their call signs in Morse code. These stations can be found locally, with some DX heard at night. Some RTTY signals are found in the upper end of this band. Marine weather and safety broadcasts, known as NAVTEX, are transmitted on 518 kHz. Your best reception here will be at night, especially during the fall and winter months. The old international distress frequency of 500 kHz is in this band, but it is no longer officially used.
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