How to connect 2 buildings via wireless

I need to connect 2 buildings that are 500 yards apart via a wireless solution.  There won't be a lot of traffic going over the link but we will have a couple of users with VOIP phones that will be connecting to the VOIP phone system so the link has to be reliable.  There is line of sight.  What robust outdoor solution can you recommend?  Although it may work, I'm not looking for the residential grade Linksys AP solution.  Thanks in advance.
menreeqAsked:
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ThaVWManCommented:
Here you go.. something like this would work:

http://www.airlinx.com/products.cfm/product/19-182-0.htm

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ThaVWManCommented:
Or this company offers products for what you are looking for:

http://www.proxim.com/

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menreeqAuthor Commented:
thanks, it looks like 3com also has a product:  http://www.3com.com/products/en_US/detail.jsp?tab=features&pathtype=purchase&sku=3CRWEASYA73

what brand would you recommend?
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Wireless Networking

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