Hi, I can't find many references to this- could an HF antenna, say a vertical,
use a shroud of rf-absorbent material to achieve receive (and transmit?)
directionality? What materials, and how close to the element could they be? I
have seen tubular rf absorbent materials that appear to be intended to cover a
cable, and I keep imagining a rotatable vertical surrounded by a "slotted
radome" (pipe), filled with rf absorbent material, with a vertical directional
slot exposed. Durable, stealthy, receive directionality, maybe? But I'm
ignorant of the effects of the absorbent material near an antenna element.
Regards,
KE5FGX
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