D-Link DAP-1720 Quick Install Manual page 9

Where should I place my DAP-1720 when using it as a range extender?
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Poor
Ideal
location
location
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Poor
Ideal
! !
location
location
! !
A Range Extender only works as well as the signal it is extending.
Therefore, proper placement of your DAP-1720 is important in achieving
desired results.
For best performance, place your DAP-1720 in between your router and
your dead zone, making sure it's placed in a location where the Wi-Fi
signal is still strong. Use the Smart Signal Indicator to help find a location
with a strong signal. The more bars lit on the signal indicator, the stronger
the Wi-Fi signal is.
DAP-1720 Install Guide 9