Re: NEC-LIST: Copper oxide.

Several aspects that are potential differences between Cu and Al:
Is the oxide layer thin?
Is the oxide layer truly an insulator?
Is there a distinct boundary between insulator and underlying conductor?
Is there a graded zone with partial oxide and partial conductor as tiny
grains (i.e. a semiconductor)?

As far as consumer TV antennas go.. they could degrade fairly substantially,
and the user would be unlikely to notice. TV sets have ever decreasing
noise figures, and one of the real benefits of a directional TV antenna is
not the forward gain, but the directivity, to reduce multipath.

"Gullwings" <gullwings_at_comcast.net> writes:
> From a radiation point of view, why would the oxide layer on copper not
have
> the same effect as the oxide layer on aluminum? The latter hasn't
deterred
> the use of "billions" of yagis as TV antennas.
>
> Malcolm M Bibby

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