An antenna for use in a portable wireless communication system in which the antenna is integral in its structure so as to function as a helical antenna when retracted and as a rod antenna when extended. The unit is connected via a connector to only some\u2014in particular only one\u2014of the radio-frequency control units. The energy-storage capacitor is discharged to the load by closing and opening the controllable switch in a single discharging process during only one half oscillation period of the series tuned circuit. The system also can include a conditions capture engine for capturing individual-specific data corresponding to predetermined health conditions. The hard coat film is prepared by laminating in order a primer layer and a hard coat layer comprising metal oxide particles and a cured matter of a silane compound on one face of a base material and further providing, if necessary, a coating layer having various functions on the above hard coat layer. The method involves binding an analyte-specific receptor species to the surface of a piezoelectric substrate, contacting the surface bound receptor species with the flowing liquid stream and quantitating the presence of the analyte.