Richard Clark wrote:
"Your explanation sounds like you are practicing psychaitry, not
technoligy."

I think quantification is valuable if the measured value is accurate and
if the value makes a difference.

Antennas are used with transmitters of megawatts of power. These have
limitations by regulations on maximum noise and harmonic content. It
depends on the jurisdiction, but maximum noise and distortion must be at
least 50 dB below the fully modulated level in some locales. I`ve often
used the H.P. noise and distortion analyzer to measure off the air to be
sure we complied with the regulation. It never occurred to me that our
antenna system had a part in noise and distortion production. I expected
curvature in a tube`s characteristics or a failed component to cause a
rise in noise and distortion. Not once do I recall our antenna system
causing distortion anywhere except in the edges of pattern nulls.*This
is normal.

Receiving antennas on the other hand deliver a satisfactory signal
having only microwatts of power. As one responder noted the dynamic
range is enormous. This is not really an issue for concern among
amateurs. Antennas are in general distortion free.

Best regards, RIchard Harrison, KB5WZI