Cisco → [Info] Cisco 1300 Wireless Access Point Distance issue

I work for a company trying to deploy wireless tablets in a construction environment. These Tablet PC will (preferably) be connected via WIFI. I have looked at some options and the 1300 AP seems to have the most features and durability for our environment. What I want to do is cover a 1 mile square area. Optimally placing a single AP in the center of a development and broadcasting to my Mobile units(a distance about 2600 feet or 1/2 mile). If I put a 1300 on top of a trailer and add ad 12 db Omnidirectional antenna(AIR-ANT24120) to it at about 25-30 in height, do you think I will get my range

In a construction site you might want to put the AP on a high ground and have 4 Yagi antennas (NEWS) positions this should give a good range and Cover the most areas but very weak signals in the corners of the Square Mile....

Ref: AIR-ANT2410Y-R