island said:
Of course, forgot about the range - like I said, slightly daft idea. I suppose the wired one might work (probably need a signal booster or something), but the 1km of wire would be a bit much, particularly if you couldn't leave it hooked up...
Hmm, there do seem to be some that do longer range, though (never tried 'em):
http://www.pimall.com/nais/wvrange.html
http://www.vfmstore.com/ir6382wl.htm
http://www.spyville.com/cmos24ghzcol.html
http://rf-links.com/wireless_cameras.htm#4
But of course they get more expensive than x10 cams by far...
I think you're on to something.
There is one transmitter/reciver for video you've found for 279US with a range of 5 miles, that could work. One could use it with a camcorder (Or digital camera w/TV-out) and a solar panel (Or a Canadian Tire power pack) at the target, and have a TV (or notebook computer) and an inverter in your truck. Total cost would probably be around the same price as a highend spotter, but you could use most of the parts in other applications. Most people have a camcorder and a TV, and an inverter and a car battery aren't that much money.
You'd need 10 watts to run the transmitter, the camcorder would have it's own battery. $160 get you a 15 watt solar panel. Or you could use a car battery, or a CT Eliminator. The Eliminator 800 ($190) would run the transmitter for 30+ hours.
If you didn't already have a camcorder, you can get 12V cameras from them for under $100US, these would be better on power. The 15 watt solar panel could run the camera (3.6 watts) and the transmitter (9.6 watts) with a little overhead. The Eliminator 600 is $150 and would run both for almost 20 hours between charges.
If you needed to buy everything: (This assumes you have a vehicle to run the TV and reciever from)
Camera: $90US
Transmitter/Reciever: $280US
CT Eliminator 600: $150CAD
7" LCD TV: $219US
2 High gain antennas: $260USD
The only question is if the camera and TV have enough resolution to show bullet holes. But if you wanted to, you could try it out before you bought the transmitter. Just point your camcorder at the target, hook it straight into your TV, and see if you can see the holes.
EDIT: you need the high gain antennas to get the 5 mile range, with the antennas that come with the transmitter and reciever you can only get 2000ft.