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Dell would be in violation of FCC Rules if they did this. The rules state that "add-on" antennas must be specifically designed for the system by the same manufacturer. This is to maintain that the device does not transmit more power than allowed under Part 15. It would otherwise be possible to add a gain antenna to a full-power output device and be transmitting excess power (and thus interfering with the primary users of the frequency band).
As such, most legal external or "add-on" antennas are attached to underpowered radios or have a switch to reduce output to compensate for the antenna gain.
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A passive antenna cannot (by the laws of physics) actually add power; it can only concentrate the radio waves.
And a lot of other devices (mostly PCI cards) do have removable antennas.