The phrase "tiny antenna" refers to a very small device that picks up signals, like a radio or TV antenna, but is much smaller in size. Full definition
Most cells in the body — including those in the brain — have a single tiny antenna. (sciencenewsforstudents.org)
In a majority opinion written by Judge Christopher F. Droney, the appeals court said the Barry Diller - backed Internet company does not appear to violate copyright law because subscribers are assigned to their own tiny antennas at Aereo's Brooklyn data centre. (canadianbusiness.com)
This means that the light is causing charges in the material to oscillate freely, like tiny antennae, resulting in the light being emitted at the same angle to the normal it went in at. (realclimate.org)