Wanting to know if the DJI Spark antenna boosters really work, and are they worth it. Looking at the picture with them mounted on the remote kind of looks a bit bulky and I don't know if I can use my polar Pro phone mount. I know the control already has a phone holder but I just like this one better?

Lots of YouTube videos that show that these do increase the range of the Spark. I have one but never use it as I've never run into a range problem. The only downfall of the range extenders is that they're very directional. You have to keep your controller pointed directly at your Spark or you can lose signal and go into failsafe