Ofcourse extraterrestrial life exists. Anyone saying otherwise is either stupid or ignorant. Do anyone honestly belive that in this vast universe, we are the only intelligent life?
And yes, humans should transmit a beacon. It should not contain any music since aliens might for some reason think of it as something aggressive. What it should do is contain litterature and simple voice recordings about who we are.
I run SETI@Home because i hate wasting ressources and because im helping a project im interrested in.
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.