I've read some of the posts regarding operating below 1.8 MHz; the 138 and 479 KHz bands and sensitivity issues. One thought might be to produce a transverter and PA that would allow operation on all of the bands below 1.8 MHz. the "Medfer" band, 479 KHz, the "Lowfer" 160-190 KHz band, 138 Khz and so forth. 73, Jay W6CJ