We are not alone in the universe; FACT. Transmit a homing signal to earth? No, not all entities have good intentions. Run Seti@home to locate ET's... Not the other way around.
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.