In this paper, we report the results of a preliminary study of the design of dual-band platform-mounted antennas. In this approach, appropriately-designed coupling elements are employed to excite a desired platform mode to obtain an operating band in the HF frequency range. Moreover, the coupling elements are also designed to act as ultra-wideband radiators within the VHF frequency band. The coupling elements are modified loops with two feed points, one at each end of the loop and they can be excited either in the common or in the differential mode. When the coupling loops are fed differentially, they excites the fundamental mode of the platform resulting in an HF NVIS antenna. On the other hand, exciting the coupling loops in the common mode allows them to radiate as a vertically-polarized, omni-directional ultrawideband radiator operating in the VHF frequency band. By designing an appropriate feed network, the coupling elements can be excited in the appropriate modes simultaneously at both the HF and VHF frequencies. This way, a dual-band antenna with narrow band, tunable HF operation and ultra-wideband VHF operation is obtained.