I would measure the signal strength of the 5Ghz band in your housing. If it is not at least -80db, I would not use 5Ghz. If you have no way to measure the 5Ghz band, I would not try 5Ghz. The safest approach would be 2.4Ghz. The Nanostations are usually better at pulling in a signal by 15 to 20db over a handheld device or laptop. Thus a -80db signal on your phone would be more like a -60 to -65db signal to the Nanostation. Since the Nanostations are directional (about a 60 degree beam) they have a lower noise floor which is good, but can be harder to aim. Thus they come with a tool to help aim them. If you get one be sure to download the Airmax guide as it explains all the settings.