All winter, spring and indeed right up to now, I have been using my FT817 and a homebrew transverter for 472kHz WSPR. Although the transverter puts out about 12W, my ERP on 472kHz is a measured 5mW from the earth-electrode "antenna". Although far from efficient, it provides me with a means of radiating a signal on 472kHz WSPR. Best TX DX this season on the band was well over 1000km to Norway on several occasions. It has copied 1525km on RX with just the FT817 without a preamp.