This post will be updated.
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Deployed this arrangement to broadcast a wireless network from an outdoor antenna roughly 150′ from one house to another.
The ‘Indoor Extension AP’ utilizes a wireless uplink from the ‘Outdoor AP’ – and you can have multiple extension APs on the same network.
Configuration is all web-based – both devices are power over ethernet – took about 1.5 hours from start to finish (not including mounting the devices).
One very neat thing is that you can download a map via Google Maps which the software uses to estimate how the wireless reception range of each AP. It errored on the side of caution as we had a 99% strong signal (according to their own metrics) outside of the estimated range between the two APs.
The software also lets you block specific MAC addresses, keeps track of traffic by client device and many other niceties that a typical over-the-counter AP would not have.
Step 1: Configure the Airport Extreme to use “WPA2 Personal” as the Wireless Security type
Step 2: Physically connecting the Buffalo router to your computer is the easiest way, if you do not have an ethernet port you can connect using a wireless link. Configure the Buffalo WZR-300HP (or any DD-WRT router) as follows:
Step 2b: Add a virtual interface by clicking ‘Add’ under the Virtual Interfaces section and configure the following:
Step 3: Click on ‘Wireless Security’ and configure the following:
Step 3b: Set the security mode and password for your extended wireless network:
At this point if you are physically connected to the Buffalo router you should have internet access – you can also connect to it via the new SSID you configured and should still have an internet connection.
To extend the signal strength of a Linksys WRT54G router (all versions excluding v8 – they no longer let you replace the antenna) you can use this adapter & antenna combination:
Ideally you would also install DD-WRT and boost the power setting up from 75mW or whatever the default it. 110mW tends to be a safe number.
If you are starting from scratch, or have extra funds, I would recommend using the Buffalo WHR-HP-G300N. You can use the same 9dBI antenna without the adapter.