the art of video sniffing
from P2Pnet:
The sport generally involves hacking up a standard 2.4GHz video receiver, equipping it with an external antenna connector, a long-lasting power supply and possibly an amplifier to boost its range. Hobbyists with more cash than soldering skills can spring for a $400 Icom IC-R3 scanner, capable of picking up wireless video signals and displaying them on a built-in two-inch LCD screen. "Experimenting with wireless video opens a whole new world for monitoring, whether for fun or security," reads the Icom webpage.