<Tr> <Td> Radiation sources / regions (show) <Ul> <Li> Boresight </Li> <Li> Focal cloud </Li> <Li> Ground plane </Li> <Li> Main lobe </Li> <Li> Near and far field </Li> <Li> Side lobe </Li> <Li> Vertical plane </Li> </Ul> </Td> </Tr> <Ul> <Li> Boresight </Li> <Li> Focal cloud </Li> <Li> Ground plane </Li> <Li> Main lobe </Li> <Li> Near and far field </Li> <Li> Side lobe </Li> <Li> Vertical plane </Li> </Ul> <Li> Near and far field </Li> <Tr> <Td> Characteristics (show) <Ul> <Li> Array gain </Li> <Li> Directivity </Li> <Li> Efficiency </Li> <Li> Electrical length </Li> <Li> Equivalent radius </Li> <Li> Factor </Li> <Li> Friis transmission equation </Li> <Li> Gain </Li> <Li> Height </Li> <Li> Radiation pattern </Li> <Li> Radiation resistance </Li> <Li> Radio propagation </Li> <Li> Radio spectrum </Li> <Li> Signal - to - noise ratio </Li> <Li> Spurious emission </Li> </Ul> </Td> </Tr>

When did wifi become available to the public