wrote in message
ps.com...
In the RFI/EMI world the maximum length
of grounding conductors has been found
to be 1/20 of a wavelength. Conductors
longer then 1/20 of a wavelength become
effective unintentional radiators. It is true
that we consider a 1/4 wavelength to be
the most effective and desirable length.
But significant radiation does occur from
even cables as short as 1/20 WL.

A 1/4 wavelength long ground wire is the WORST possible length. A 1/4
wavelength line acts as an impedance inverter (just as in transmission
line). So the low Z at the ground rod gets transformed to a hi Z at the
radio- making the ground totally ineffective.

Dale W4OP