I've seen mylar glued to plastic with spray adhesive after the spiral was cut for solar. the transmit /receive ones were alum. sheet.
What if you wrapped copper wire around a cone, then wrap the wire with something w/ adhesive to hold it in place, and then put it inside the cone?
That would seem to restrict the input to a narrow area but still give a lot of surface to receive signals just like the spiral. LT
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