The TEW-713RE extends a wireless network by repeating the wireless signal from your existing wireless network. It is not an antenna booster. Do not place it near your current wireless Router or access point.
After configuration, the unit should be placed where your current wireless signal starts to degrade. A good tip would be to use a laptop with a wireless adapter and walk to where you are attempting to extend your wireless network. Place the unit in a location where your wireless signal drops to 2 bars.
Avoid placing the TEW-713RE in a location that has a very weak signal. Extending a weak signal will bottleneck your performance at the weakest link.