Internet advice

Hi all

Just need a bit of advice on what device to buy.

We have etisalat Internet in our villa we have standard etisalat router which is located on the upper floor.

The signal down stairs and in the garden is very weak and in certain rooms no signal at all.

I am sure there is a gizmo I can buy I would prefer a single gizmo to boost the signal rather than one for each lap top.

I am sure emax will be the place I know there are one or two tech wizard on here who will have the answer. Emax is great but the sales people seem to know less about electronics than I do.

Any advice appreciated
Thanks