Abstract: A novel multiband fractal antenna at very different frequencies has been proposed. For the proposed antenna, several optimized opened rectangular slots have been loaded on two arms of bowtie antenna. The novel antenna not only can obtain very different operation frequencies, but also can work at four bands at the same time. Both simulation and experiment show that the proposed antenna has good performance at each band. Because of the proposed novel antenna, the kind of fractal antenna can be enriched and a feasible structure for realizing high performance multiband antenna at very different frequencies can be provided. 