in radio rf systems the other subsystem 20 in fig1 includes a receiving component 50 that is capable of receiving the electromagnetic radiation emitted by the source 45 in the embodiment shown in fig1 the receiving component 50 is another antenna 50 connected to a receiver 55 the other antenna 50 converts the electromagnetic radiation received from the source 45 into modulated electrical signals the receiver 55 demodulates the modulated electrical signals and provides the demodulated electrical signals to another electrical component 60 the information that was carried by the modulated electromagnetic radiation emitted by the source 45 is carried by the demodulated electrical signals received by the other electrical component 60 in the embodiment shown in fig1 the source 45 and the receiving component 50 are substantially collinear in embodiments in which the source 45 and the receiving component 50 are substantially collinear the source 45 and the receiving component 50 are substantially aligned with respect to which other there are embodiments of this invention in which the source 45 and the receiving component 50 are substantially aligned with respect to each other without being collinear in the embodiment in which the source of electromagnetic radiation is an antenna and the receiving component is another antenna embodiments in which the source antenna is substantially omnidirectional do not have to be necessarily aligned the decision to select an embodiment where the source and the receiving component are aligned involves considerations of cost power requirements and electromagnetic interference and compatibility in embodiments such as the embodiment 10 shown in fig1 in which the source 45 and the receiving component 50 are rf antennae the modulating component 40 and the receiver demodulator can be selected so that they conform to one of.