https://www.astronomy.me.uk/wp-content/uploads/2026/02/Calculating-pyramidal-horn-gain-different-apertures-080226.pdf Post navigation Signal attenuation (loss) for common coaxial cables at around 1.42 GHz (1420 MHz), relevant for builders of amateur Hydrogen Line radio telescopes. Software for Hydrogen-Line Radio Astronomy (H-Line RA, 1420 MHz)
