> And your point is ?? That is not the only place where substitute > arithmetic will produce a > different figure.
I ran a 4Nec2 (with NEC/4.2 engine) surface wave plot for a 160m 1/4-wave vertical radiator over a field of 60 radials with average ground conductivity. Input power = 1.5KW. 4Nec2 was first set to analyze field strength at 10 km or 60 wavelengths on 160m. That's way out there... http://72.52.250.47/images/160m.jpg Next, I ran a simulation of the far field plot for the same radiator: http://72.52.250.47/images/160m-1.jpg The far filed shows zero field strength at zero elevation. By contrast, the surface wave analysis shows that the field strength never drops below 12.2 mV/m at any elevation, including zero elevation. I'm just the messenger.... Paul, W9AC _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK