Due to statistics, and logic, I am convinced that there is extraterrestrial life intelligent enough to communicate with our planet. I am not sure, though, if this is the best approach to detect their presence, but its worth a shot.
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.