Connecting PCs using WRL-00559 Modem

Hi everyone!

I have a goal which is to stabilish wireless connection between 2 PCs, probably via usb ports, using this modem:

http://www.sparkfun.com/commerce/produc … cts_id=559

The data will be a 1Kb string, 3 times a minute, in a range of 500 meters across the street.

May someone please just enlight my way buying the right components I need to build the USB adapters and the receiver?

Thanks in advance,

Anderson