In reply to Bjartur i Sumarhus:
I am not an expert. But the important thing is the letter after the 802.11 standard on your router's documentation.
802.11n is what most modern routers use and maxes out at 600 mbps
There is a new thing called 802.11ac which doubles that
2 caveats:
1: your device also needs to support the standard, so a laptop that's 10 years old will be using pre-N standards which are around the 10-50 mbps range. Not much you can do here.
2: real world usage will always be less than the above. "In the sticks" will work well for you as long as you can get the signal through any thick stone walls you might have; on the contrary in London for example, there just isn't the spectrum for wifi to run at anything approaching a reasonable speed (when you do a wifi search in a standard house you'll pick up 25 networks).
Edit: this is all backwards compatible. So if you have an N router and a non-N device, it will work, just slower than it otherwise could do.
Post edited at 11:34