I've got poor signal strength and quality in one of the rooms in my house. This room has a single ethernet cable. I would like to extend my network so that said room upstairs has a better signal. I have a 100Mbps connection, but this "bad room" only gets about 50Mbps over WIFI. I have an arris dg1670 modem / dual band wifi router. I want to extend my signal in the best way possible with minimal signal loss and maximum speed. My network supports Windows 8 and Mac OS's.
I am considering a wifi range extender. Will any range extender do or do I need to find something that supports dual band 5GHz? Do I have any other options (access point) and why would I consider them over a range extender?
Note most of my equipment is WiFi only.