A first transatlantic contact on 630 meters (472 kHz) has taken place between David Bowman G0MRF and Dave Riley AA1A
They used the JT9 digital mode to complete the more than 5,160 kilometre contact during the early hours of 23rd December 2017.
On the UK end, G0MRF was running a modified Icom IC-7300 with a filtered preamp and a 60-W amplifier to a 250-foot wire configured as an inverted L. AA1A benefited from his near-Atlantic Coast location in Marshfield, Massachusetts, Bowman said.
ARRL Story - http://www.arrl.org/news/radio-amateurs-continue-to-plumb-the-spectral-depths
472 kHz Site - http://www.472khz.org/
G0MRF Projects Website - http://www.g0mrf.com/