Does router's antenna direction matter or it is just placebo?

raksrules

Elite
We all have routers with one or more physical antennas on them which can move in many directions. Like I have a router with 4 antennas. But I am not sure If pointing an antenna in a specific direction sort of concentrates the signal in that direction or so.
Will it help if I point all 4 antenna to 4 different directions to get wider coverage or say point all 4 to a single direction to make sure that pointed direction rooms are served well with the Wifi signal?
 
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