For best results, the DAP-1320 needs to be placed in an area where it receives good signal from the extending source (router).
If the DAP-1320 is placed in an area where signal strength is poor, it will not be able to properly extend the signal.
D-Link suggests placing the DAP-1320 approx half way between the source (router) and the desired area you want to provide coverage to.
Proper Placement
Improper Placement