The one I've got come from Jarcar, i cant do the link thing, but it was about $50 and it works great, i have had plenty of people come up to me and ask where i got it because they cant get reception. The amp is 12volt but goes at the bottom, i have it hard wired in the trailer and run a TV coax extension between it and the antenna. What i thought was a wank is it has a motor in the antenna housing to rotate it that is powered thru the antenna lead and a remote control, but it is great when your laying in bed and can fine tune it when you have a poor signal
Edit just checked and the catergory number is LT3143 and they are $64.95 now. I am going in to get a new one as this one has been bashed around in the old tent days. They dont look much but mine has lasted for years and works great am only replacing it cause ive built a nice new camper
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