A conformal, planar, and low profile ultrawideband (UWB) antenna with monopole-like radiation and band-notched characteristics is presented. A circular patch shorted to the ground is combined with two rectangular slots and two concentric rings, to achieve an ultra-wide bandwidth from 3.8 to 8.3 GHz with a single rejection band from 5 to 6 GHz. The monopolelike radiation features, generated by combining TM01 and TM02 operating modes of a circular patch antenna, are maintained over the entire operating bandwidth. The antenna has only 0.046λo height at 3.8 GHz and is realized using polydimethylsiloxane (PDMS)-conductive fabric composite technology making it highly flexible and physically robust. This was validated through severe bending tests at various curvatures.