A typical 11b base station has range 30m indoor and 100m open. I think garden is fine.
11g and 11a versions have shorter range.
if the range is not long enough, you can get one wireless bridge (or multi-mode access point)to exted the range, kind of relay or daisy chain, for example Asus WL-330B Pocket Wireless Access Point 802.11b (11Mbps)£19.12 click here
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