This invention relates to the identification of individuals in the population who are at particular risk of suffering from disorders associated with neurocognitive degeneration, such as Alzheimer’s disease. Preferably, the harness uses five pieces of webbing, namely, two curved webbing shoulder straps, two identical leg straps, and a subpelvic strap. The antenna apparatus may move in a partial or continuous loop around the subject, toward or away from the subject, or in an opposite direction to an associated antenna apparatus. The first sub-recording film is formed of a first material containing Si as the main component.