I just installed the Jack ant. in my TT - it's the one Roy shows at the bottom of his post. Unfortunately I was not able to use the add-on style nor was I able to put it in the same place as the old one. So I had to snake the single co-ax from one side of the TT to the other. There are no other wires than the normal coax.
As far as placement, the instructions don't indicate there will be any blockage issues if it's close to the AC. They only wan't you to place it far enough away that the rotation of the ant. doesn't interfere with the AC or any other obstacles. Mine ended up about 10" away and I'm getting 31 stations. The Jack is not quite as tall as the AC for those with clearance concerns.
A neat feature is the signal strength indicator on the rotator inside. It make it easy to figure out witch direction to aim the ant.
I haven't had a chance to use it yet but we're going to a CG today that I have never been able to get a single station at so it will be a real test.