Ham radio people use the moon to bounce signals to places on earth below the horizon. It’s called EME, for Earth-Moon-Earth bounce.
We can bounce signals off of buildings to get around other buildings using directional antennas too. We can use mountains, whatever.
Yes, I’ve seen it myself, it’s another great proof of how far the moon really is without even needing to get as fancy as lunar laser ranging.
Never heard of that before and I thought you were joking, as the moon is such a small percentage of the earth’s sky and on top of that it is spherical and only a small portion of it’s surface will reflect back to earth. I’ve heard of bouncing skip off the ionosphere, but what kind of precise wave propagation would you need to actually bounce a signal off the moon at a specific spot over the horizon?