The thing is, our antennas are placed down on the curve of the fender and the antennas (Taco/4Runner) are built accordingly. While generics can adjust for SOME angle, most will leave your antenna canted over even at max tilt. There is no way to know for sure unless you try.
Also, the generics are usually manual sectionals and not the whips favored by the off-road crowd. This is personal taste.