An Ultra-Wideband sharpener for excitation a symmetric antenna, wherein sharpener comprises: - an avalanche transistor which through its base is connected to an source of pulses (In), through its collector is connected to a timing resistor, coupled to a source of high voltage, and a forming capacitor, and through its emitter is connected to an emitter resistor, coupled to a ground, and a positive pulse control capacitor, - a step recovery diode which via its anode is connected to a first pumping resistor, coupled to a positive pump source, and through its cathode is connected to the positive pulse control capacitor and to a second pumping resistor, coupled to a negative pump source, - a symmetric antenna comprises two identical parts (18A; 18B), wherein one part is connected to the anode of the step recovery diode and other part is connected to the cathode of the step recovery diode, characterized in that UWB sharpener further comprises: - a base resistor where it is connected to the base of the avalanche transistor and to the emitter of the avalanche transistor, - a load resistor and a negative pulse control capacitor where the load resistor and the negative pulse control capacitor are connected to the forming capacitor, and other end of the negative pulse control capacitor is connected to the anode of the step recovery diode, and the other end of the load resistor is connected to a ground, - matching resistors (16, 17), wherein the first matching resistor is connected between the anode of the step recovery diode and the one part of the symmetric antenna, and the second matching resistor is connected between the cathode of the step recovery diode and the second part of the symmetric antenna. - an avalanche transistor which through its base is connected to an source of pulses (In), through its collector is connected to a timing resistor, coupled to a source of high voltage, and a forming capacitor, and through its emitter is connected to an emitter resistor, coupled to a ground, and a positive pulse control capacitor, - a step recovery diode which via its anode is connected to a first pumping resistor, coupled to a positive pump source, and through its cathode is connected to the positive pulse control capacitor and to a second pumping resistor, coupled to a negative pump source, - a symmetric antenna comprises two identical parts (18A; 18B), wherein one part is connected to the anode of the step recovery diode and other part is connected to the cathode of the step recovery diode, - a base resistor where it is connected to the base of the avalanche transistor and to the emitter of the avalanche transistor, - a load resistor and a negative pulse control capacitor where the load resistor and the negative pulse control capacitor are connected to the forming capacitor, and other end of the negative pulse control capacitor is connected to the anode of the step recovery diode, and the other end of the load resistor is connected to a ground, - matching resistors (16, 17), wherein the first matching resistor is connected between the anode of the step recovery diode and the one part of the symmetric antenna, and the second matching resistor is connected between the cathode of the step recovery diode and the second part of the symmetric antenna.