I've just moved from a house that had walls made of paper to a house that was built circa 1901 and the walls are really thick. (great when you have 3 noisy teenagers) BUT its not very good for my home network and the wifi router.
Is there any bit of kit I can buy that will help boost the signal all around the house.
You might consider an either an omni-directional antenna which will give you a bit of gain over the built in one click here about double the signal strength.
Or for considerably more gain a directional antenna click here it is more expensive, but it will squirt the R.F in the direction you want rather than spraying in all directions like an omni-directional one and will give nearly 20 times the signal strength over the basic set-up.
You will see an improvement with MIMO devices such as the Belkin Pre-N router. These devices use technology which is likely to be built into the next wireless standard, 802.11n. Claim to give much improved coverage and throughput.