Abstract: The present invention pertains to the field of medical diathermy and addresses issues of incidental undesired radiation in the prior art. The invention uses a multitude of pairs of intentional radiators with each pair driven with an identical but out-of-phase signal. The pairs or radiators are spaced near the target tissue in close proximity to the target but sufficiently distant from each other so as not to cancel the nearby tissue heating effects. Local heating of tissue is achieved by the high electric and magnetic field intensities coupling and inducing electric currents in conductive tissue.