Your results will vary depending on your location but here is my expierence.
I spend (usually) half my summer in a campground that is in a dead zone.. NO tv reception with the winegard batwing save a couple of stations from across the River (Canada).
Added Batwing: Picked up a couple of Detroit stations about an hour's drive away
Added Sensar Pro: Picked up the rest of them. (Well all but one).
NOW... Some facts:
The wingman is a UHF director array, the basic batwing is bi-direcitonal, If the wings point east and west, then stations to the north and south are "Peaked" .. The wingman makes it so only one direction is peaked, and it is way more peaked. Gives the antenna a range of about sixty miles on UHF.. (VHF range is already about 60 miles) (NOTE Range depends on many things, the 60 miles is over a test range, odds are you won't do that well)
IT sharpens the antenna's vision, like a set of field glasses (Binoculars) or a telescope.
The antenna has a small pre-amp in it.. Non adjustable.
The sensar pro has a second ADJUSTABLE pre amp in it, along with some aids for pointing.
Page 2.
IF you are in the middle of a bunch of statiosn so they are all about you not all in one basic direction... This won't work as well as say a Jack.. but if you are "A long way from happiness" (The tv tower) it's the best there is.