In November 1961 a group of world renowned scientists convened for discussions on the subject of intelligent extraterrestrial life. Following the conference, a coded message was devised and sent to all of the participating scientists to gauge the difficulty in deciphering artificial extraterrestrial signals Only one of the recipients (Carl Sagan could not!) was able to decode the message. Given that all involved were of the same species, spoke the same language and were familiar, to the greatest extent, with the principles used for the coded message, some idea emerges of the problems to be faced in interstellar communication. The coded message below, representing a single continuous string of 1s and 0s, uses the same technique employed in the 1961 message. Being that geocachers are not of the same species and do not speak the same language as the scientists, this might be a better gauge of non human species ability to decipher terrestrial signals. On the other hand, the scientists received a version with a single continuous string of 1s and 0s about four times longer than composed for geocachers, a lower life form.
Below is a false color image of a signal received by a large ground based radio antenna in 2004. It is the first instance of a signal that could not immediately be discounted as due to terrestrial interference or stellar sources. A portion of the signal may be heard using Windows Media Player.
You can check your answers for this puzzle on Geochecker.com.