whether or not one utilizes direct dc coupling of the microradios to the antenna feed points or couples the rf energy from the dipoles associated with the spaced - apart contact pads on the microradio , in the subject invention one selects only those microradios that are within a certain variance of a preferred direction and then makes sure that the polarization direction of all of these radios is in the preferred direction are identical , in one embodiment by utilizing digital coding , which both activates the microradio and is used to sense the polarity associated with the connection from the signal source to the contact pads .