wireless network interference after move

Hello everyone,

I had the pleasure of moving my company from San Mateo to Fremont this 
month and I think a neighbor in the park has a much more powerful 
wireless transmitter than we do, unless my wireless router has suddenly 
started it's decline.

I have a D-Link DI-684 which was performing pretty flawlessly at our 
previous location. Sometimes we could see an additional wireless 
network, but it never interfered with ours. Since our move, the managers 
in the offices along the wall shared with a neighboring company are 
having trouble connecting to our network. I noticed there were one or 
two other wireless networks available when they have the problem which 
lead me to believe there is some interference.

The signal strength is usually strong to excellent, but they are unable 
to connect at times. I tried to move my router closer to their location 
thinking the other networks were operating at a higher power and that 
closer would be better...it didn't appear to make any difference.

How can I insure the inability of my managers to connect to the wireless 
network is the result of the neighboring signal? Any easy ways?

Thanks,
Brian.
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