Region : UnitedKingdom

Model : TL-MR3420

Hardware Version : V1

Firmware Version : .???

ISP : Three "3"

Hi newb to this site.need some help please to someone who thick,I have TL-MR3420 and use a three (3) Dongle as we have NO land line,I use a mini Mac,iPad 3,Kindle,to get the Internet.If I am close to MR3420 we get agood signal and to best place to put the MR3420 and Dongle is in the front bedroom But if we are down stairs in the back room of the house the signal is not very good.If I put the MR3420 in the down stairs back room NO signal at all.
So I am thing of the MR3420 up stairs front bedroom good signal "BUT can someone please tell the Best way to go from here?poss powerline PA511kit or WPA281 OR ??????????

Can you help Please

Thanks oh new year to all.