making a Conical Scalar Ring?

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Here's a couple pic's I found by "googling". Looks like a funnel, covered with foil. :)
 

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Scalar designs are normally fruits of RF Electronic Engineers, but random experimentation can yield useful results and are encouraged for the hobbyist. Walrus1957(?) an EE has posted extensively on homemade conical scalars for offset reflector applications.
 
Cone Scalar

You might try this.
 

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