I have a camera which I made using a camera designed for the back bumper of a car. It has a colour monitor and I just added some cable and bought a small 12v battery. I fixed the camera on to a plastic gooseneck and just attach it to a telescopic pole when I need to use it. I have recently modified it so that I can attach it to the top of the gutter vac but I still haven't tried it out yet. It does the job. One thing I have found is when the sunshine is bright, its hard to see the monitor.
ps I bought it on ebay