hi Dimitrios,

On 11 Oct 2011, at 23:37CEST, Dimitrios Tsifakis wrote:

> ...

> By the way, has anyone in the group experimented with transmitting
> into the ground with earth probes? It seems to be working reasonably
> well here, in fact I have been thinking that it's comparable to my
> very limited inverted-L LF antenna...
> 
> http://people.physics.anu.edu.au/~dxt103/136/earth/
> 
Amongst other things, it depends on the geology.  G3XBM has managed 5.6 km with 
5 W RF at very low frequency.  On 87 kHz with 4W SSB (cave radio) in limestone, 
the best I know of is 1.6 km two way and 2.5 km one way in the French alps.

It is always worth trying.

John F5VLF