Get a couple of these babies
Features:
- Complies with ISM 2.4GHz IEEE 802.11b/g
- DSSS/OFDM Technology
- Connects at a full 54Mbps via USB 2.0,
High Speed Transfer Rate for 802.11b/g.
- High Output Power up to ~ 1200mW
- Free Space Capable upto 2000m.
- Support 64/128-bit WEP Encryption, WPA, WPA2
- Support Windows 7 (32bit, 64bit) / Vista (32bit, 64bit) / XP / 2000 / ME / 98
- Support Linux, Max OS.
- One external9dBi Omni antenna for better performance.
I have one and its quite impressive and should do well at 150-200 meters if placed properly.