Metra Amplified Hide-Away Antenna 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