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SNT make a small transmission unit that will fit in the back of the camera housing. It will give power to the camera and transmit the the video signal on a FM carrier about 500 - 800m (check specs) all on one coax. The noise rejection of this unit is fantastic. I tested it in a carpark with existing cameras that was suffering from ground loop problems and very low signal (incorrect cable installed). Put one of these units up and the picture was as if the camera was 1 meter away from the monitor. No I don't and have never worked for SNT. http://81.29.69.21/cmsserver/snt/index.cfm?page=single.cfm&sectionid=54

My take on the IP debate. Old style CCTV with coax, camera and a monitor will (provided you use quality products) will produce a better image quality under all circumstances than IP. Period. IP solutions offer advantages in terms of ease of install and connectability. IP will get better with time, a year or so ago most IP cameras touted as security cameras were little more than re-badged webcams. There are some new lines of cameras from the major CCTV manufactures that are starting to hook up a good imaging device to a half decent video codec in a single package called an IP camera. There are other issues with the IP solutions, example... No standard: I can fit a mix Panasonic, Sony, Bosch, etc CCTV cameras to a conventional system and they work happily together. In the IP arena you have to use the same manufacturer kit through out, or mess about with trans-coding software/hardware multi format trans-coders that only work with the formats listed on the box, and not the format of the camera the client wants added in two years time.

Keep it RGB if at all possible. Use a broadcast cable if the distance is an issue. I understand cost is an issue, but every video to vga/svga type converter I have used or seen used results in a degraded picture that suffers noise and or hum. If you do go the converter route, get it on trail if you can and try it out.

Using Addlestone coax amps and correctors I have seen "useable" pictures out to 7KM on motorways using CT125 cable.

Looks like a re-badged one of these. http://81.29.69.21/cmsserver/snt/index.cfm?page=single.cfm&sectionid=52 If it is, the transmitted picture is very good. (Note: I have only used the PAL version)