Today, I got all the things together and put up a page with instructions on how to modify a Linksys Bluetooth USB adaptor in order to connect a directional antenna. The guys from pentest did that last year already for an MSI dongle… but this seems to be a little more complicated than modifying a Linksys dongle (which already has an external antenna).
A modified Linksys dongle is not so new. Actually, we used a modified Linksys dongle as we did the Long-Distane-Snarf in Santa Monica. I think the one we used there has been put together by Mike Outmesguine. But I am not sure on this. It could also have been done by the flexilis guys.