The general setup for a point-to-multipoint would be to have an AP / bridge at the central site with an omnidirectional antenna, with directional antennas of some sort at each of the remotes.
You could do the 1300s at the remotes, and a 1240 at the central location.
The 1200 series can be configured with cabling and external antennas, but the AP generally stays indoors. The goal would be to keep the antenna cabling as short as practical, because there is a lot of loss at these frequencies.
It is also desirable with any external system to have a segment of fiber between the externally-connected components and the rest of the network (to keep lightning and other "environmental events" outside where they belong).
The fiber link is frequently in the form of copper-fiber transceivers between the APs and the switch they are connected to.
This would be in addition to the so-called "lightning arrestors" ... which protect the LAN from lightning about as much as an aluminum foil "bullet-proof" vest. They do serve a purpose, they drain static and field/ground charges and *reduce* the chances of a lightning hit, but a direct hit, or near hit, without a fiber segment, will roast everything on the LAN, and probably the phone system and everything else electronic in the neighborhood.
The qualification, up front, is that a good site survey should always be done.
In your case, you could probably do a very basic check with a couple laptops and some "pringle can" type of antennas... but if you do not have a visual line of sight, don't bother, that is the absolute minimum for any hope to communicate.
Good Luck
Scott
