How an Antenna Works — very good, general

Very good basic explanations, overview, animations. https://www.youtube.com/watch?v=LmvfphxyRuo   Patch (square, half-wavelength) Parabola Yagi-Uda monopole, dipole Horn           The Yagi-Uda antenna, commonly referred to as the Yagi antenna, is a directional antenna design widely used in radio communication and broadcasting. It was invented in 1926 by Japanese engineers Hidetsugu Yagi and Shintaro … Read more

Resonance: Beings of Frequency documentary

Watch from 18:00 in to find out about what’s really killing all the honeybees. https://www.youtube.com/watch?v=YFR5EtO_zdM   “Resonance: Beings of Frequency” is a documentary film released in 2012 that explores the potential health effects of electromagnetic radiation, particularly from sources such as mobile phones, Wi-Fi networks, and other wireless technologies. The film investigates the concept of … Read more

The Mystery of the 17th Harmonic

FAA and FCC chase down a shortwave radio broadcaster whose 17th harmonic is found to interfere with airplane radio at 132.26 MHz   https://www.youtube.com/watch?v=mOOfs2iVeso   SEE ALSO https://soundquality.org/?s=sine+square+15+khz       The concept of the “mystery of the 17th harmonic” refers to a phenomenon in music theory and acoustics that has intrigued musicians, mathematicians, and theorists … Read more