The context of my post had nothing to do with how useful or not the ground plane kit was, it was commenting on weather or not the antenna met the advertised claim of being a "balanced antenna". Therefore, at best your reply is out of context.
Speaking to it anyway... As you have a rather strong opinion about said ground plane kit, you are going to believe what you want to believe no matter what anyone says, and that is fine. But there are people (including myself) who have seen adding a ground plane kit to some a99 or Imax antenna installations appear to help said antennas. When this happens there was a problem with said antenna the owner likely didn't even know they had. I tend to prefer other solutions to said problems, but the ground plane kit is an available, workable option when said problems do come up, especially for those that don't have easy access to someone who may have other solutions.
As you and your acquaintances didn't have any of these problems, well that is normal, and I guess to a certain extent lucky. Most of the time people don't have said problems, but sometimes some people do. If you or your acquaintances did have such a problem, would you know how to fix it without said ground plane kit? Would you even know if you had said problem?
The DB