with the elements to influence the performance the spacing between the flap and the surfaces is one of the factors contributing to the capacitive value and the tuning process changes the spacing in the preferred embodiment the flaps are bendable and allow movement while also being rigid enough to maintain the moved position the flaps can be attached to either the horizontal or vertical surfaces and there can also be multiple flaps on a single surface the flaps can be secured in a number of ways including soldering welding or adhered with electrically or insulating conducting adhesives one end of the flaps can be grounded either on the vertical or horizontal surface and bent over the gap or the flaps can be isolated on both surfaces and merely capacitively couple at the gap in one embodiment there are shims of differing thickness placed between the flap and the surface and used to accurately space the flaps from the respective surface in addition the flaps can be mounted on the interior and function as disclosed herein especially for production models that require minimal tuning in the disclosed embodiment the flaps 122 are bent over the gaps 106 and positioned in close proximity to but not to be in direct contact with the side panels 132 142 the tuning process can be done in either order but.