u`ll need to have a repeater on a place that didnt get the connection.. there is no one device solution

a) repeat the wifi connection (might not be great)
b) multiple hotspot (need to run cable on the house).

also suggest u to pickup the one that have 5ghz band instead of an old 2.4 ghz if u live in densed population..

u can find an example here on the vid, although he is using quite expensive device..
Pimp My Wifi - Solving Problems & Shopping at Sim Lim Square! << search on youtube.