The IP66-rated outdoor housing for Gigaset is made of weather and UV proof plastic material. So this will not have an influence in the range of the built-in transmitter. Inside there is also an electronic controlled heater/fan unit. The standard unit can be mounted directly to a wall or ceiling; in addition they also offer a mounting bracket which can be used as pole and corner mount.
Gigaset PRO Outdoor Gehäuse für DECT Basis N720/N870 230VAC Version