A higher antenna gain is better than a lower value and the overall gain of an antenna indicates its ability to pick up a radio signal. The direction by which the electromagnetic waves flow is referred to as the polarization or the orientation of the emitted radio waves. In general most antennae radiate either linear or circular waves. Three key terms that govern the operation of wireless devices are frequency, period, and bandwidth. Frequency represents the oscillation or movement of a signal per unit of time. The frequency of a wave refers to how often it completes a cycle with respect to a uniform period of time. Frequency and period are inversely proportional to each other. To prevent regulations from stifling the development of electronic equipment most countries belong to the International Telecommunications Union and comply with its recommendations concerning the utilization of frequency.