[Leica] OT: Infared or radio

[reid at mejac.palo-alto.ca.us (Brian Reid)]

> ...and around corners, no direct line of sight?

If the corner that it's going around is the prow of a battleship, it 
probably won't work. If the corner that it's going around is a Japanese 
paper lantern, it will work.

Radio waves travel in a straight line, give or take some bouncing that you 
can't count on. So don't think of it as "around corners", think of it as 
"through obstructions", and pay attention to what the obstruction is. I've 
used it through trees in a wooded area.