I made my own and they work very well with my P3 4K
If you make your own, use a template for proper parabolic measurements so the signal gets directed to your antenna. Now remember, they work extremely well..but only if theyre directed towards your drone.
I made these two parabolic directional "dishes". They definitely extend the signal, but they only extend the signal if you focus them in the direction of where the drone is. Find a template online and you can make them for basically free and the ones you can buy are SMALL.
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