VLF (very long waves) power magnetic ferrite rod antenna for Sferics signals to 50 kHz and VLF (very long wave) of 15-70 kHz. The signal figure is very clean, also in the dampened operation. Material: Bundled ferrites of high permeability, CuL, shockproof cast in PE housings. Professional Neutrik© plug's for 1/4" jack's. Length 340 mm.