Wow, thanks for all the replies!
It sounds like the X10 could work out after all if I replaced the antenna as explained. Really my requirements are only that it be wireless, omnidirectional, powered by batteries, and have a DirectShow driver (usable as a webcam) since that's the technology that I use for the video analysis portion. I'm kind of new to the hardware side of these projects and as such have avoided cameras that have to be connected to the wall. Of course, that's just DC power and easy to supply.
I guess another possibility would be to use a magnetic sensor as a compass or maybe a gyro to position the existing antenna, but that sounds error prone.
How good is the image by the time that it is captured by the PC? Would it be clean enough for object tracking?
Thanks,
mipsy