The AX-31B antenna is a compact VHF/UHF directional antenna with an in-built amplifier, which provides a low-cost alternative to conventional VHF/UHF antennas (for example discones), especially for indoor professional and amateur applications.This log-periodic antenna is constructed on a high-quality fibre-glass substrate, with a 20dB amplifier directly mounted on the substrate, together with other surface-mount circuitry and a standard 9V PP3 type battery holder. A power switch is provided directly on the antenna.The antenna is ideally suited for reception of VHF/UHF point-to-point communication where its directional characteristics can significantly improve rejection of interfering signals.In professional applications, this antenna is ideally suited for EMC pre-testing, surveillance and monitoring.The antenna covers a frequency range of 230 to 1600 MHz (a much wider frequency range can be received with reduced gain).AX-31B Antenna with supplied cable.The AX-31B antenna package includes a 2 meter (6.5 ft) cable with an SMA connector for the antenna and a BNC connector for the receiver. Battery is not included.While designed to be entirely general-purpose and performing well with any third-party equipment, the WiNRADiO AX-31B Planar Log-Periodic Antenna is especially suitable for WiNRADiO 1000/1500/3000 Series of receivers.The antenna is designed for indoor reception. Its small footprint, the size of an A4 sheet of paper (11.5" by 8.5"), conserves space and makes concealed installation possible, if desired. The antenna is lightweight and installation can be achieved within minutes using double-sided adhesive tape.