The kit will consist of the tube with a drain nipple on the bottom, the power antenna unit, rubber/plastic tubing to run from the antenna tube to an exit point in the floor (to allow water that might collect in the tube to drain), and a reinforcement strip to support the antenna to keep it in place. All you will need to do is select a location, either where the fuel filler was, or on the other side of the cab), make the hole and fit it to the tube, and weld in place.
I am just getting to the point of de-burring and welding up the tubes, and I just got the first batch of antennas in. Should have them ready to go in a couple weeks max. I haven't set a firm price yet, but probably around $65-$75 complete. I will probably also sell the tube without the antenna is someone wants just that.
Just picture this:
