1. Omni antenna (ceiling Omni or whip antenna) shall be installed in the center and radiate all directions.2. It is better to use a directional panel antenna or Yaggi antenna when the area shape is long and narrow(corridors, long row of houses in two sides, tunnels or elevators or rural open space).Requirements to indoor antenna installation:• indoor antenna should be 5 meter distance from an outdoor antenna• indoor antenna should be at least 2 meters above the ground• indoor antenna should be fixed vertically with the ground.

Nikrans NS-150-Multi Installation Manual