The source was observed three times at a frequency of about 1420 MHz, which is expected to be a frequency used by extraterrestrials due to its proximity to one of the main frequencies at which hydrogen absorbs and radiates photons.
There are a number of puzzling features of this candidate, which have led to a large amount of skepticism. The source is located between the constellations Pisces and Aries, a direction in which no stars are observed within 1000 light years. It is also a very weak signal. The frequency of the signal has a rapid drift, which would correspond to it being emitted from a planet orbiting nearly 40 times faster than the Earth around the sun. However, each time the signal was detected, it was again at about 1420 MHz, the original frequency before any drift.
There are also a number of potential explanations for this signal. SETI@home has denied media reports of likely extraterrestrial signal. It could be an artifact of random chance, cosmic noise or possibly just a glitch in the technology.