Wireless Ethernet cards

[BigFred]

Hi Folks

We have a small ethernet network in one building, the company has bought another building across the street and about 500 yards further along. There will be another small network in this other building. The file servers, mail server, DHCP server, internet access etc. is all in the first building.

I wish to network the two buildings together, and am considering using wireless ethernet cards.

I believe that I need a dedicated PC in each location to house the wireless cards, and an ordinary NIC. (Both networks will be part of the same domain)

Could someone who has done this please advise on the best operating system to use in the dedicated machines, whether any other software is required (perhaps it will be supplied with the wireless cards) and whether I can put a second wireless card in one of the dedicated machines to service another site which is not curently connected to the network?

All advice on card types, pitfalls, or links to tutorials, appreciated. Thanks BF