A few minutes ago I went QRT on 6m and 10m WSPR. I am now active on 630m (472kHz) WSPR with 5mW ERP on TX from the earth-electrode "antenna" On RX (80%) I am not using the preamp. For the avoidance of doubt, I am also using the earth-electrode "antenna" on RX too.
UPDATE 2225z: In the last 2 weeks my 5mW ERP from the earth-electrode "antenna" has been copied by 23 different stations. This evening it was copied by F1AFJ (607km) in JN06HT. I am sure my earth-electrode "antenna" is not the best antenna for the band by a long way, but it shows large areas of real estate and big antennas and ground systems are not necessary to achieve decent results on WSPR on the 472kHz band.
17 Dec 2015
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