Omnidirectional or Directional

Hello guys !

Haw can I know my RB352 wireless router omnidirectional ? Problem that it is working only in directional altought it has antenna.I changed antenna mode A and B .

We are planning to get more wireless router for our home and office users if it will work as we want.

What is yours opinions ,which antenna to use for centrall site where 10 client routers will direct to this router ?

Second what router I must use for home and office users ? It means that I must buy one router to each user ?