Re: Longitudinal Wave Experiment

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

>
> > reactance are exactly half those of an isolated half-wave dipole.  The
> > radiation from the vertical antenna is vertically polarized, and the
maximum
> > field strength is at the ground level (or angle, if you prefer). Along
the
> > same lines, a TC is equivalent to a very short vertical helical radiator
> > with capacitive top loading, and will excite the same currents in the
> > ground.
> >
> > Exactly.  There is a mirror image of the antenna radiation pointing into
the
> > ground but with opposite polarity.
>
> And that's exactly what it is - a mirror image, created on the surface of
> the ground plane (attracted charges, and current loops).
>
> There's NO field below inside the ground plane.

Only if the ground plane is a perfect conductor....  That ideal ham antenna
location.. A hill (for height above terrain) covered by saltwater marsh (for
good conductivity)....

For real ground, there is significant field in the earth....
>