Looking for advice on improving WiFi signal in my 3 story home.  Currently it is not good, no wifi in garage etc.  My Shaw Hitron Modem (soon the XB6) is in the basement where my feed is.  I have wired Cat 5 connections on the main floor.  Can i shut off the wireless on my Shaw Modem, purchase a new router, connect that to cat 5 and place on main floor.  If so do i need a switch?  Will the signal be stronger with this set up?  Thanks for any help.