An antenna for radiating UWB RF pulses is disclosed. The antenna may incl a transverse electromagnetic mode (TEM) horn antenna section connected to a pair of a resistively loaded parallel plates. Each of a pair of protrusions may be connected one of the parallel plates and a shunt network is connected to the parallel plates. Each of said parallel plates includes a plurality of plate segments having varying widths. The protrusions may have a geometric shape such as a quadrilateral, rectangle, square semi-circle or triangle. The protrusions may be made of metal such as copper or aluminum or a resistive material such as carbon. Alternatively, the protrusion may be made of plated PC board such as glass epoxy or duoroid, a carbon composite or fiber glass plated with a conductive material such as copper, tin or carbon. This invention may also be used for narrow band applications, as the shunt network can be tuned to null certain frequency ranges.
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