'Due to the tight spaces within the Mac mini, both the AirPort Extreme card and the Bluetooth module attach to the Mac mini's motherboard via a special connector. Apple hasn't made it clear whether that connector is included on all models or only on those that have had AirPort or Bluetooth preinstalled-adventurous types may be able buy an AirPort Extreme card and install it in a Mac mini themselves.
But Apple doesn't recommend it-the company suggests that you let an authorized Apple service professional perform upgrades.' Click to expand.Tom's Hardware had a review with plenty of pictures. One of them may help, on this page: Now, that *looks* like a standard Airport Extreme card to me, but it also looks like it's on a dughterboard which may not exist on Airportless minis. The pictures on the following page might provide more clues. Note that the first couple have the aeriel leads visible.

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The card behind the CD and hard drive *could* be the same daughtercard (seen from the 'bottom' in relation to the picture with the airport card), and if it is then it looks like they all have it since the hard drive and CD drive plug into it. -zoara- [1] Full URL.