Just be sure they're dji.. lot of off brands I hear horror stories about
Also make sure they have been stored properly, and still are chargeable, as any new P3 battery was likely still manufactured a very long time ago, and Lipo batteries start dying on the day of birth, not the day first placed into service.
It depends on your area. I'm in a heavy urban area and the windsurfer do help in getting range. Just have to keep the direction to the bird.
At worst, a windsurfer improves signal stability at close range. In most cases, it will also boost range by 20% or more, by concentrating the signal in a specific direction, if used properly, and pointed at the aircraft. If you are not seeing any benefit, it is likely user error.
That's how I perceive it also, given it makes the signal directional, rather than (standard) non-directional.
The windsurfer also helps when flying directly above yourself at higher elevations, where the omnidirectional antenna is worst. Just aim the windsurfer up, to direct the signal above you.
I actually tried that using my ARG antennas the other day, and found (to a degree) this helps. ALSO found that even slight left to right body movements change the fringe signal connectivity.
I've ordered one too; for a couple of bucks from China it's worth trying...I've posted elsewhere recently about what cost me $70 for an ARG kit, and really I have found virtually none if any difference in range!
