[Skunkworks] How do you find your nearest 3G Base Station.

Is anyone aware of any websites/resources where you can find the location of your nearest 3G Base Station in your area including the name of the network provider. Like a map of your local area with the different mobile phone Base Stations displayed. I have trawled through Google and some of the websites for leading telecoms providers but cannot t find anything that’s accurate. Your assistance is very much appreciated Thanks Vince