A circuit interrupter for interrupting current on a line conductor is provided. The fungal primordium is allowed to grow and fill the mold to form a mass of fungal tissue equivalent in shape to the designated shape of the mold after which the mass of fungal tissue is removed from the mold and dried. A second antenna element is disposed at the second corner of the ground plane and includes a second slot. Accordingly, the surface motions are correlated to the strength of the bonded joint.