5G technology would provide high data rates and high-quality multimedia applications. This technology needs a broad bandwidth antenna. Among various antenna types, the hexagonal-triangular fractal antenna has advantages of compact design, low-profile material, wide-bandwidth of frequency work, and low-cost material for the antenna. This paper proposes a modified Hexagonal-triangular fractal antenna for 5G at 28 GHz and ultrawideband (UWB) application. The modification consists of a tapered feedline section, a smooth notch on the ground plane, slit on the ground plane, gap-filling on patch section, and adding a reflector. The dimension is 35×52 mm. From simulation and measurement, the proposed antenna design can work from in a range frequency of 2.4 GHz until more than 30 GHz. By combining with a planar reflector element, the obtained gain is 7.65 dB at frequency 6 GHz. The proposed antenna fulfills the frequency requirements for UWB application and 5G Application.