This is the Medium wave Broadcast band (also known as the "AM" broadcasting band). The channel separation is 9 kHz in Europe, Africa and Asia, and 10 kHz in the Americas. In the United States, the frequencies of 1230, 1240, 1340 1400, 1450, and 1490 kHz are allocated only for local stations (low power) and you may simply hear a 'rumble' on those frequencies, esp. at night due to the heavy congestion. Many powerful stations in South America use a non-standard frequency step in this band.
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