This 20dB antenna amplifier is a very simple antenna amplifier circuit that use few common transistors ant some resistors .
This antenna amplifier circuit can be useful for signal waves with a frequency between 0.1 to 400 MHz and has a gain around 20dB . T1 transistor must be BF200 type (or similar ) and the other transistors can be BF214 type . For high efficiency , the antenna amplifier must be placed at a small distance from antenna .
This amplifier circuit can be powered using a power supply that supply an output voltage between 6 and 12 volts DC . For powering this device you need to use a shielded cable or a coaxial cable .