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 l

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.