Extending AirPort Extreme BASE STATION range
I am using an older (2006) 54Mbps AirPort Extreme Base Station and want to extend the range. I am experiencing issues with dropped or slow signals in rooms that I would consider tough to reach (basement for example). Can I use an AirPort Express to extend the range of the WI-FI and how exactly is this done? Or would I be better off updating the AirPort Extreme Base Station? It's worked flawlessly for 6 years, just have more wireless requirements.
Thank you all in advance.
AirPort Express 802.11n (1st Gen), Mac OS X (10.6.8), Home Network