I've had a pesky sort of problem for a couple months now that my CEO's computer can only see our wireless network but not our neighbors and couldn't see any in the city of Manhattan from his tower-high hotel room. Another contractor could see every other wireless network except ours; ditto for three new contractors that started this week.
But all the Dell Latitude D630s with (Dell Wireless 1490 Dual Band WLAN Mini-Cards) in the office could see all wireless access points including ours and the upstairs neighbors.
After many fruitless google searches, I finally extracted a clue.
The Cisco Aironet 1131AG in my office was only broadcasting over 802.11A, whereas the wireless network adapters of various makes and models including an Intel Wireless Wifi 4965AGN in a Sony Vaio and an undocumented card in an Acer were only listening on networks other than 802.11A.
So did two things:
I enabled 802.11G on the Cisco Aironet.
Then on the CEO's Vaio, I went into the properties of the wireless adapter
On Vista - Network and Sharing Center > Manage network connections > right click on the wireless adapter, select properties > select Configure > Advanced
in the list, look for something that goes by various names like Wireless Mode, Band Preference, or just search through the list until you see something that makes you choose whether you want 802.11 a/b/g or some combination.
On the Vaio, I could choose 802.11a/b/g and voila! CEO's vaio could suddenly see everyone's WAPs. I haven't tested on the other machines, but I'll repost if it doesn't solve the issue.
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