Pyramidal Horn Calculator This calculator calculates the optimal dimensions of a Pyramidal Horn. Click on link below to see examples of calculation for hydrogen line radio observing (1420 MHz): https://www.astronomy.me.uk/wp-content/uploads/2025/12/Pyramidal-Horn-Calculator-with-examples-091225.pdf Post navigation Designing and building a 1-metre-aperture horn antenna for 1420.405 MHz suitable for hydrogen-line work. Chokes for hydrogen line cantenna feeds
