Alex GM3ZBE alex at gm3zbe.plus.com
Thu Apr 22 09:57:42 PDT 2010

Andy is correct, its NOT a case of the lower the better for NVIS.  
That's only true if you have a copper plated back garden and can cope 
with very low feedpoint impedance.  Modelling suggests that the optimum 
for NVIS  is about 1/4 wave high.  If you go lower then ground losses 
start to outweigh theoretical NVIS gain.
Alex, GM3ZBE

Andy Cook, G4PIQ wrote:
> FWIW - that's not my experience. I prefer 60-70ft dipole height for domestic
> contests on 80. I don't see any reduction in strength of close-in stations
> (and that's reflected in the models), and your earth losses go down...
> Andy 

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