Your laptop may have a better s/n ratio than the Axim. You can view your s/n ratio in the WLAN client on the Axim and possibly in your wireless client software on your laptop. My laptop has a better s/n ratio than my X51v, but it has a nice antenna (and a plug for my
cantenna).
The density of the walls and other solid objects in your house can significantly impact the wireless signal. Moving your wireless access point could help, but the most surefire way to get a better signal is to find a router with a larger broadcast range.