The Wilson Electronics Pole Mount Accessory Kit (901117) has a wall-mount bracket to attach the included 10 inch pole to the fascia of the house. You can then attach your weBoost or Wilson antenna to the pole using the included U-bracket.
Since many new homes no longer have a pole on the roof, or any other way to mount an antenna, the Wilson 901117 helps provide a method for mounting your weBoost/Wilson antenna.