Merry Christmas.
The Jack antenna is wonderful. What you see is what you get, it does not extend any longer or higher, but it does swivel around.
I looked around, and didn't find a lot of options for a good powered HD antenna.
You turn the crank inside until you get all 5 little LED lights to glow, that's telling you you are pointed in the right direction. It's a signal strength indicator.
The antenna does have a power boost, so you need 12 volts to run it.
I think I can get 40 channels off that antenna, both HD and standard channels.
It requires about a 2" hole to mount on the roof. I was not thinking far enough ahead when I insulated my ceiling to put a solid block to mount to. I should have sandwiched a 1" thick board in-between the roof and inside ceiling for a sturdy mount. So I was forced to mount a plate on the roof for strength. I distributed the load across 2 roof trusses.
Here is the inside controls (see the green lights. You shoot for all lit = best reception)
I made a template of the antenna base, Measure 10 times cut once = fit perfectly
The directions called for the actual antenna wire to go outside of the white plastic base, (you can see a little notch, that I filled with silicone) so the wire would have been exposed. With a little figuring, I was able to run through the roof under the base and come out right beside the inside mounting plate. I think this is a much superior mounting idea. Why would you want a loop of antenna wire exposed on your roof????
Gadget Man
but that would meen have to sell Gadget Mans Adventure Trailer. 
I can't have two trailers.
