You can build a highly effective rectangular horn antenna using stiff cardboard sheets lined smoothly with aluminum foil, or sheets of lightweight galvanized sheet metal. Online calculators (like the Kraus Horn Antenna Calculator ) provide exact dimensions based on your target frequency of 1420 MHz.
Complete Guide to Radio and Radar Astronomy Projects for Beginners radio and radar astronomy projects for beginners pdf
Neutral hydrogen (HI) emits radio waves at exactly 1420.405751 MHz. This allows you to map the spiral arms of the Milky Way. You can build a highly effective rectangular horn
An RTL-SDR dongle and a simple directional Yagi antenna pointed at the horizon. 4. Hardware Shopping List for Beginners This allows you to map the spiral arms of the Milky Way
Mount your antenna firmly. Connect the LNA, then feed the coaxial cable (use high-quality RG6 or LMR-400 cable to reduce signal loss) into your SDR USB dongle.