Advice on router

[abstibus]

I am with TT for my wireless service (ha, ha).
I was using a Zyxel router which wasn't great, so I tried the free TT one, which is absolute rubbish. Getting this set up involved a 50 minute call to TT in Kolkata.
I wonder if anyone could give me some advice? It seems to me I will have to buy a router, but I have no idea which one - I do not understand the technical jargon that comes with the descriptions. Would one with an antenna be best?
My house is quite big, but as I type this, I am using the laptop in the room next to the router and the signal strength is 'good' only.
If I move upstairs to the room almost directly above the router, forget wireless. I have tried moving the router into the hall, but the signal didn't improve.
Should I just contact TT and complain?
Any advice would be very welcome.

[Ellipsis]

You could just keep what you've got, and invest in a repeater to hugely extend the range. We have one of these and it works great around the house and garden:

Amazon.co.uk User Recommendation

[rojash]

Your IP is responsible for delivering an Internet connection to your home. Given that every building varies in its construction, there are many different kinds of wifi adaptors, and differing levels of local interference, they can't be expected to take responsibility for the wireless link between your router and each of your individual devices.

As Eliipsis says, you might want to consider a wireless repeater, or you could also consider an ethernet over mains connection, or a combination of ethernet over mains coupled with a wireless repeater.

Amazon.co.uk User Recommendation

[abstibus]

Thank you both. I just cannot make up my mind about which is better, as the reviews give conflicting accounts of their usefulness.

[beso]

The problem with some wireless routers is the signal mostly propogates horizontally. The worst place for reception can be directly above it.

I use a Belkin. It has two internal antennas configured to give three dimensional coverage. It works well for us but we live in a single level house so I don't really know about its vertical performance.