6666.6 kHz 6666.6 USB 6.666.6 MHz radio amateurs 45 metros. Hearing several OMs talking over each other, complete with the whistling into the mic thing. Heard a signal report and general pleasantries (similar to traffic heard on 6900 kHz and other frequencies on 45 meters/43 meters). OMs calling and replying to calls on frequency. 6666.6 USB is similar to 6900 LSB, although 6666.6 USB seems to be more active when the band is open to South America and Central America. Spanish language traffic heard via COMMSIGMA KiwiSDR on the CT/MA border at 2135 UTC + ongoing.