I have done some wardriving using a laptop, Wireless PCMCIA card and netstumbler. I detected a number of networks but the internal antenna in the PCMCIA card only gives a general idea of where the Wireless Access Point is located.
I would like to use a yagi (unidirectional Antenna) and triangulate to give a more accurate result, but I cannot find a wireless b/g PCMCIA card (or USB device) with a connector for an external antenna.
I have found various web sites with instructions on how to 'modify' devices to attach an external antenna, but I do not feel confident in doing this.
Does anyone know of such a device with an external connector???