Flying Saucers for windows is a 1” copper foil that is attached anywhere on a pane of glass in the vertical direction. They are directional. Set of 4 for $30 free shipping worldwide.
Flying Saucers for windows address RF coming in from outside. We also have Flying Saucers for unused wall outlets to prevent RF from entering the home AC wiring.
Sound will have more air and more high frequency energy.
Free shipping, payment via PayPal.