Seriously
speaking, the difficulties are
very big,
as rightly says Stefan 160 meters band, has a very different behavior
but, do not
forget that in 1901 Guglielmo
Marconi received a signal
across the Atlantic at a frequency around 500 kHz and with a receiver that in comparison
with those of today was a tack. Ok were "only"
3500 Km.
Today
what are we doing more with our ultramodern equipment?
Today we have SDR,
filters, DSP, noise reducer, Marconi at Signal Hill had a drop of mercury.
Yes. VO1NA, who is relatively close to the Marconi RX site also heared
me in CW on MF.