Discussion
In order to reduce skin effect at UHF:
Answer: C
At UHF, Copper tubes with silver plating are used.
At ultra-high frequencies the skin depth is a few micrometres, so the current flows only in a thin outer layer. The centre of the conductor carries almost nothing, so a hollow tube is as good as a solid rod and saves material, and plating the surface with silver, the best conductor, lowers the resistance of the layer that does carry the current.
Solid rods waste the unused core. Painting or anodizing coats the surface with a poor conductor, exactly where the current flows, and makes matters worse.
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