Hawking introduces USB adapter with an 8 dbi antenna: This thing looks very 1950s sci-fi retro, but produces a remarkably strong, directional signal. It has five LEDs that show signal strength, too, which should help improve directionality. It'll retail for about $70.
Now there are two approaches to reaching further with Wi-Fi: brute force and smart antennas. This is the prettiest example of brute force I've seen. But is it better than beamforming and spatial multiplexing in MIMO's finesse?