Pirates most often use 6925, 6950, and 6955 kHz, although 6855, 6875, and 6990 kHz are also sometimes used, as well as other frequencies. But the first three are by far the most active. You can also see, at different times of the day, shortwave stations like WYFR, as well as utility stations, spy number stations, and other users of the spectrum.
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Move your cursor to see the freq/UTC of part of the waterfall.