When I was a kid, I had this toy that was a cardboard tube with a 12-14" plastic parabolic dish on it and a microphone at the focus with earphones. It was surprisingly effective at letting you hear conversations from long-ish distances.
Reading this page made me wonder just how good the NSA's version of that toy is these days assuming they've got multi-microphone and signal processing gear at least as good as (and probably an order or two of magnitude better than) what Apple will sell you for a few hundred bucks...
Hi gain 2.4/5GHz antennas aren't "necessary" for wardriving, but they make new things possible if you do use them...
Reading this page made me wonder just how good the NSA's version of that toy is these days assuming they've got multi-microphone and signal processing gear at least as good as (and probably an order or two of magnitude better than) what Apple will sell you for a few hundred bucks...
Hi gain 2.4/5GHz antennas aren't "necessary" for wardriving, but they make new things possible if you do use them...