When synchronized, the collection of small antennas act like a single «super antenna» that broadcasts power into the cavity at a much higher than normal rate — a process called superradiance because the collective emission is 1,000 times more intense than independently radiating atoms. (sciencedaily.com)
It won't outperform smaller antennas in areas where signals are strong, but for hard - to - get stations, no antenna short of a roof - mounted one will do better. (consumersearch.com)
In addition, antenna size is inversely proportional to frequency size, so higher - frequency signals would require smaller antennas. (scientificamerican.com)