In the course of developing a Shield Ground Adapter (SCA), two deficiencies were found: existing technology ground adapters require shipyards to stock large numbers of ground adapters of different sizes and style, and the frequency range of the test fixture is limited NUSC have developed a new concept ground adapter that works equally well with different cables, conduits and stuffing tubes, in a wide range of different size combinations. In conjunction with this development we have combined the modified MIL438999 hiaxial test fixture with a network analyzer S-parameter test set, to extend the usable frequency range and sensitivity of the test method to one giga-Hertz