Lectrosonics ALP690, LPDA (log periodic dipole array) antenna with a built-in RF amplifier; Frequency range 470.100MHz to 692,000MHz; RF Amplifier Gain Range: -6 to +12 dB in 1 dB steps; When no power is applied, the antenna automatically switches to passive operation; Durable finish and weather tolerant construction for indoor/outdoor use; Dimensions (W x H x D) 27 x 33 x 4 cm; Weight 335 g; Colour Black.