Reliable wireless?

[hewitt_tech]

I have a client who has a computer mounted on a roll around cart and who wants to connect using a wireless connection to their LAN. Unfortunately there are  8 strong wireless networks nearby with at least 3 being unsecured. Their application uses a client/server model and when they get disconnected from their own LAN, they lose any data that they have typed into the application. I'd like to improve the reliability of their wireless connection. I'm considering setting up a bluetooth connection to a nearby computer. Other things I've thought of using are Irda, 802.11a (5 ghz range) or 900 mhz wireless. 

I suspect part of the reason their wireless connection drops out frequently is that they are experiencing interference from the other wireless access points. In any case the system wants to connect to unsecured access points before connecting to their own secured access point despite my attempts to make their access point the preferred connection.

Any thoughts?

-Alex
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