[wmf]

If you first track down the location of the access point, then you know the directional antenna is pointed at you. From there, the direction finding is easy.

I think a major part of the rant is that Tor isn't provably secure against yet-to-be-discovered attacks, and several attacks against Tor have been discovered (and fixed) over its history.

[shaddi]

Right, but the idea behind direction finding is that you can triangulate the position of the transmitter. If you just have a bearing you have to search over a large area -- these links could be many kilometers long.

Not saying it's impossible, but using highly directional antennas makes direction finding much more difficult.