Replacement Amplified Hide-Away Antenna for AM/FM Bands. Active magnetic-type antenna. Works on the magnetic field associated with a conductor excited by a microwave. Voltage pickup is Nanovolts, but with the magnetic type circuitry it extracts a signal with a superior signal-to-noise ratio. 102 Inch Coaxial cable and power supply wire Replacement Amplified Hide-Away Antenna for AM/FM Bands Active magnetic-type antenna. Works on the magnetic field associated with a conductor excited by a microwave. Voltage pickup is Nanovolts, but with the magnetic type circuitry it extracts a signal with a superior signal-to-noise ratio. 102 Inch Coaxial cable and power supply wire. Gain FM -0. 6 db AM – 2/4db.