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Its a rectangular cavity 29.4 x 58.5 mm with a gasket in the surrounding flange. I'll need to seal it against weather and was thinking some thin (1.6mm) PTFE sheet (I have an abundance of the stuff) or acrylic.
I'll line the printed horn with self adhesive aluminium tape, but I need some dimensional guidance please. Could I scale from a similar X band horn and expect results? Or I could fab it from DS GRP PCB, solder joints on the outside.
Not found any particular design software (read=free) to assist, unlike almost any other type of antenna....