There is a legitimate device used in electronics for controlling frequency and filtering signals. It is a Quartz Crystal cut to a specific size, usually a thin wafer, and used as a piezoelectric device with a specific resonant frequency. This is not the Quartz Crystal Antenna that is being sold at various websites and social media on the internet.
The popular antenna version comprises a plastic box with metal plates inside and a single external electrical connection. Additionally, a box of raw quartz crystals is provided without much guidance on their usage, presumably to be placed in the box with the metal plates. The instructions suggest attaching devices to two 44-inch wires to create a dipole antenna. However, in this setup, the crystals would be superfluous as quartz lacks electrical conductivity. The wire, which acts as an antenna, is not included in the kit, while the box of rocks serves no practical function.
