My config is an HP Laptop(HP G0-230US Notebook & Atheros AR928X wireless).

Originally, it came with Vista. When I booted Vista, it would automatically
locate nearby access points (routers), tell me the signal strength of each &
secure or not and allow me to select which one I would like to connect to.

I have trashed the Vista OS and installed Ubuntu 9.04. Now it does NOT
automatically locate nearby access points. I know the wireless card works
because it automatically connects to my wireless router at home. But no other
wireless routers.

I tried "make avail to all users" under the Network Manager but that did not
seem to help.

I have the following values in my wireless connection:
SSID: Hard coded for my router
MTU: auto
AVAIL TO ALL USERS: Y

SECURITY: WEP 40/128-bit Key
WEP Index: 1
AUTHENTICATION: Open System
METHOD: Auto (DHCP)

All other entries are blank.

Perhaps these entries are blocking all other access points?

Do I need to set up a 2nd wireless connection for roaming?

Suggestions/questions?