Build your own Parabolic Dish 1.5m

https://www.rfhamdesign.com/downloads/rf-hamdesign-dish-kit_1m5_kit_spec.pdf

Build your own Parabolic Dish 3m

https://www.rfhamdesign.com/products/parabolicdishkit/3meterdishkit/index.php

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Septum Dual Mode Feed Antenna

http://www.w1ghz.org/antbook/conf/SEPTUM.pdf