Bridging for extended range

A very common question I get from clients is, how can they extend an existing Airport Extreme Base Station (old model) to get extended range. I know that bridging is possible, however can someone give me a simple outline of how this is accomplished?

The typical scenario is someone has either a Linksys router or an old Airport Extreme Base Station and they want to have internet access from one end of their large house to another room (or basement), workshops or mother in law suites near their home. Naturally this isn't to much of an issue with the new N capable macs with a new Airport Extreme Base Station, however since wireless is become a 'fad' I'm getting this question a lot more often.

 

Excellent! Thanks so much!!