This UHF antenna amplifier circuit or UHF antenna booster circuit can be used to amplify or boost the signal of UHF band from 400 MHz to 850 MHz. This circuit is using only single transistor and provides 15 db amplification. For best results keep all the leads of the components as short as possible and fit the     
circuit in a water proof case and install it near antenna. Shield the transistor from other components. L1 and L2 are equal to 2 turns of 0.5mm enameled copper wire woud on 3mm former, both the coils are aircore. L3 and L4 are equal to 10uH HF choke or 0.2mm 10 turns on ferrite core.The current consumption of the circuit is between 5 to 15mA. To power the circuit the voltage is fed through the cable by using a choke coil so it will prevent the DC voltage from entering in to the TV. 
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