Im building a local wireless network and im going to use the Aironet 1552E outdoor cisco access point, with 2 patch-directional Antenna 8dBi (AIR-ANT2588P3M-N) at 2,4 GHz.
The problem im facing is that i have to cover a specific area with really thick walls (about 80cm cement and stone made). That obviously decreases my signal a lot. (i currently use an indoor cisco aironet 1130 (2dBi) and its really hard for it to have more than 3-4 signal bars inside the room).
So i would like to know, how can i calculate the distance that the new access point with the patch antenna's going to cover?
Or where can i find any specifications about the stength of the signal and the coverage area in real enviroment?