The
Harvard SETI group
constructed a listening
device called META, the
Megachannel ExtraTerrestrial Assay. This device
scanned (1985-1994) 1 million radio frequencies simultaneously
to look for signals.
The upgrade instrument (1995-present) is called BETA. Do you know
why?
SETI today also includes
Project Phoenix, in which 1000 "promising"
stars have been targeted for observations (listening).
There is also the
SERENDIP
project at UC-Berkeley
(SERENDIP is the Search for Extraterrestrial Radio
Emissions from Nearby Developed Intelligent
Populations) which piggybacks on other observations
made at Arecibo.
The SERENDIP data is reduced by people around the
world in the
SETI@home
project.