You're in luck! David Schneider, the author of this piece, also built a $150 hydrogen line antenna for us, based on a TV tuner SDR: https://spectrum.ieee.org/t

You're in luck! David Schneider, the author of this piece, also built a $150 hydrogen line antenna for us, based on a TV tuner SDR: https://spectrum.ieee.org/track-the-movement-of-the-milky-way-with-this-diy-radio-telescope https://spectrum.ieee.org/track-the-movement-of-the-milky-wa... :)