If it's borderline you'd be fine with a better antenna on one end of your connection. If you buy it for the client then you don't have to worry about more neighbors seeing your AP. Tons of this stuff on ebay. Look in the <a href="http://computers.listings.ebay.com/Wireless-Networking-WiFi_Antennas-Repeaters-Extenders_W0QQfclZ3QQfromZR11QQfsooZ2QQfsopZ2QQsacatZ86718QQsocmdZListingItemList">antenna section</a> for something directional. Parabolic, tight focus panel, or cantenna. Cantennae are cheap to make but it may not be worth your time.
For the Linksys you need an RP-TNC connector. Lots of options at ~$40 with cable included.
If there's any chance of upgrading to MIMO equipment it'll probably have plenty of range out of the box. Expect to double distance & throughput without any messing around. Much more expensive though.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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