...On Saturday, April 17th, many of
the world’s large parabolic antennas
(sometimes called dishes) along with hundreds of amateur radio operators
and their gear will stop their normal work and swing around to track the
moon when it rises. Volunteers will then use the EME or Moon Bounce
transmissions to link up with other dishes and antennas worldwide via
the
moon. Signals are literally being bounced off the moon’s surface and
back
to other stations on earth where they are received some 2.5 seconds
later.
Yes, at an atomic level we are actually shaking each atom on the moon’s
surface every so slightly and they then radiate the signal back into
space
and to earth where we again use our high gain antennas and dishes to
receive them...
http://echoesofapollo.com/moon-bounce/