Directional Antennae for mulitiple rooms

[r.born]

We have 3 classrooms that we'd like to set up with wireless access, but only one room will be online at any given time. The rooms are next to each other, about 20'x25' each. We're considering keping a WAP in the center room and using a dirctional antennae to increase signal strength when the outer rooms are used. Maximum of 25 clients.

Does this sound feasible? What's our best bet for an antennae?

[murabi]

60-75’ total? You probably don’t need any special antennas with the 350 series. The 340’s have lower power transmitters so they may need the additional antenna or just an additional AP. Your site survey should give you the detail of which way is most feasible.