Abstract: A compact wideband impulse radiating generator directly driven by a fast rise-time Marx generator is designed. Low-inductance capacitors of 3 300 pF are chosen as energy storage capacitors, and helix inductors are utilized as charging and grounding elements. By means of rapid discharge of each short gas spark gap, wave erection can be realized on the output load. The Marx generator is fitted into a 477 mm long tube with 145 mm diameter. The generator is pressurized with an N2/SF6 mixture. The system consists of two parts, wave oscillator and radiating antenna, and can work at 10 Hz repetition rate. The peak radiated field is about 40 kV/m at 1 m from the radiating antenna, with a center frequency of 206 MHz.