Extending range of Time Capsule

I was using Airport Express for my wifi connection and in order to improve the range, bought an 1 Tb Time Capsule as Apple's overview of this product claims that it has a greater range. I am afraid that, in my case at least, I can see no tangible improvement. in other words the signal 'dies' at about the same distance from the unit (appx 30 ft). Is it possible to 'extend' the range by using an Airport Express unit?