Don't know much of the specs of that amp but it won't do much from an fpv perspective because the frequency that the amp is intended for is more for the av side of the transmission which would be mounted on the aircraft not at the ground station.
Edit:
Long story short, it's not the type of thing that you Are looking for
Yeah it would be for my cell phone. However, there are only a few of the that the phone companies actually want you to use. They have gone as far to say they are causing lots of problems with towers. They are a hot topic. My response is that if they had better coverage people wouldn't use them. I had a 3 watt model on my house for a while that was made by Wilson. The cell phone company straight up gave me a femtocell when I went to replace it.
Anyway, I was joking that one of these might get your fpv stuff noticed when you have a big 3watt amp screwing with the cell network near you.