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The PCMCIA RoamAbout cards I have are all 915MHz DEINA-AA parts which use a large external antenna module and the Intel i82593 PHY controller chip. Their antenna is physically quite large as you can see from the picture to the left. More Images are available.
There doesn't seem to be an copies of the printed documentation I have (EK-DEINA-AA.A01) but there is some documentation over at the mirror of the Networ Products Website RoamAbout Wireless Documentation