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The connector is a standard industry connector. It is the same type used by the internal antenna on the Snow airport stations. Which can be modified rather easily to accept and internal antenna. I haven't done it personally but i have seen a few websites showing how it can be done. They used a lucent wavepoint antenna. So you could use any antenna not just doctor botts
 
I thought the snow AP's used lucent cards and that being the case I can tell you this is not a standard lucent connector, I know this because I have a number of lucent based cards, antenna's and connectors.
 
Sweet link... I knew it was just a matter of time b4 someone braver than me would crack one of these babies open 🙂 thanks yzedf
 
Airport Extreme Antenna Connector

The connector is made by Lucent and is known an an MCX connector.
See: http://www.vonwentzel.net/ABS/ExtendedExtreme/
The connector that just plugs into the ext antenna socket is a proprietary apple part and all you'll be able to get is the right angle type. This will require modification or going inside the case.
Hopes this helps
 
APX antenna connector

It's called an MCX connector. The ones that are available from parts sources are right angle which will not just plug in to an Extreme base station.
 
High gain airport antenna alternatives?

This link takes you to an interesting site:

http://www.hyperlinktech.com/web/re14p.php

If I am reading this right the adapter on the bottom will allow you to hook an Airport up to the antenna. The company also sells an entire line of other 2.4 antennas that go up to 24dBi! They say if the connector you are looking for is not listed to call their sales department. If you can hook up an airport to one of these high gain directional antennas I would imagine you could get them to put the right connector on all their line. Can you imagine the range that you could pull out of a 24dBi antenna? The big questions are if you can really do this, and if you do is it still 802.11g? For anyone who wants to find out I would love to hear some feedback.
 
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