Dear Stefan, Transmitting a signal above 8xxx.00 kHz by using frequency multipliers is not legal. Keep in mind that *all* matching devices and antenna structures are part that system called a "TX". T
Stefan, techically speaking I do not have any problem with your idea. But if it's legal? What would this mean in practice: As class-E-amateur I am not allowed to transmit in the 20m band in germany.