An antenna for a military ground vehicle having a radio includes a whip element and a base plate attached to the whip element. The base plate has a first set of dimensions. The antenna also includes an antenna adapter that is attached to the base plate. The antenna adapter has a housing having a second set of dimensions and a filter circuit coupled to the whip element and the radio. The filter circuit is configured to tune the frequency of the antenna. Alternatively, the filter circuit may be disposed within an antenna mount used to mount the antenna to a vehicle.