Roger Hayter wrote:

snip

OK, lets not treat it as aerial question. Though this is an aerial
group, I would have thought propagation was on topic. Can I ask if
there is any information around which would give us some guidance on
what power one would need in a dampish country about 200 by 800 miles
across to intercommunicate by ground wave at 1.8MHZ? I think this is
actually the gist of Spike's question, assuming everyone uses decent
vertical aerials (a big assumption, of course).

http://www.itu.int/rec/R-REC-P.368/en

Follow the link to the latest version, language, and format desired.

Covers the frequency range of 10 kHz to 30 MHz.


--
Jim Pennino