They are much more expensive, but there are wireless bridges designed for outdoor use, like the Proxim Tsunami...
QuickBridge. This kit includes a pair of bridges, outdoor antennas, surge arrestors and Ethernet cables. Both antennas would be mounted outdoors. You'd connect one bridge to an available switch port on your wireless G network. You'd connect the other bridge to a PC (or hub) at the second home.
You can find a list of wireless bridge products at Wi-Fi Planet.
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