Used item in perfect working order complete with instructions and original box.
The MFJ-1020B indoor active antenna offers good performance from an extremely compact package. This antenna system can be set directly on your desk! The MFJ-1020B covers 300 kHz to 30 MHz in five bands. With built-in 21 inch (53 cm) telescopic antenna. An auxiliary antenna jack is provided. When it is used the MFJ-1020B functions as a preselector. Front controls include gain, band select, tune and ON/BYPASS. A red LED indicates power "ON". Size: 5 x 2 x 6 inches (128x52x154 mm) with 21 inch whip. The auxiliary input and output jacks are RCA phono type. The MFJ-1020B requires a 9 volt battery or a 9 - 12 VDC power supply (such as MFJ-1312D).