• Type: Passive receiver preseletor
• Frequency: 1.6-30MHz
• Size: 162 x 56 x 85mm 
• Weight: 600g
• Gain 20dB 
• Sockets 4 x SO239 
• DC supply 9-18v 

The MFJ-959C Receiver Antenna Tuner/Pre-Amplifier is designed to properly match your antenna to your receiver for better performance from 1.8 to 30 MHz with a single antenna. Maximum signal power transfer occurs when the impedance of the antenna matches the impedance of the receiver. This will happen at specific frequencies as determined by the length of the antenna. At these frequencies a tuner is not needed. If the antenna is used at frequencies other than the resonant frequencies, the signal from the antenna to the receiver may be significantly reduced due to the mismatch of the antenna to the receiver. The MFJ-959C can transform the antenna impedance to match that of the receiver for maximum signal. The MFJ-959C also has a broadband transistor pre-amplifier to help boost signals to a copyable level which is especially helpful on the older receivers which lack sensitivity. A 20 dB attenuator is also built in to help receivers plagued with overload problems from strong signals.