Is there any way I can reduce my wireless range?

Hi,
I'm looking into ways of making my wireless connection as secure as possible, and one thing I would like to be able to do is reduce the range in which it is accessible.  I have a very small flat, so I do not need the signal to cover vast distances, so why broadcast all the way down the street when I don't need to?
Any advice welcome.
On a different note, when I first set up my connection last month - and for about the first 10 days of using it - it was set to security type WPA-PSK.  I hadn't changed any of the encryption settings from default (i.e. WPA+WPA2 enabled).  I subsequently changed my security key to something stronger and the security type then changed without me doing anything else to my settings to WPA2-PSK (I find that strange, but hey ho).  I subsequently discovered that WPA2 is far stronger encryption than WPA, and that WPA can be hacked.  Was there a chance my wireless security could have been compromised during those first 10 days - nothing I can do about it now, but I guess I'd like to know for future reference. 
It would of course be a big help if BT advised their customers about all this sort of stuff before set up, but they seem to think supplying basic information along with their default settings is enough!
Thanks,
J.

Well, there are a few things you could do...
Redecorate your whole flat using tin foil (including the windows)
Line all the walls with lead
Connect by ethernet and turn off the SSID (You'll need to opt out of Fon if a V2 hub is in use)
Open the hub (assuming it's a V2) and remove one of the two omnidirectional antennae
Also, it's doubtful that anyone did connect. You could check the home network via the hub manager.
By default, the hub (V2) is secure, plus you've already changed the wireless key
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