There are a few key factors involved in the use of these boosters. You should remove the protective film over the reflective surfaces, and insure that you fully seat the reflectors on both antennas. When properly installed they should be firmly seated on the antenna bases with the tips of the antennas protruding out of the top of the boosters. I always tilt my antennas slightly forward as it makes it easier to see the phone screen and the boosters don’t interfere with control stick operation. The tilt angle of the antennas to the controller is unimportant, but it is essential that the operator always insures that the flat (not the top) of the antennas is always presented to the drone. The signal is weakest off the top and strongest off the side of the antennas.

 It is important that the operator understand that these boosters make the antennas much more directional. That means that when you are flying your drone, you need to keep the cups of the boosters pointed at the drone because that's where the signal will be strongest. It's not so much an issue when the drone is very close, but critical when the drone is far away and the signals are weaker. To be clear, the boosters will still strengthen your connection to the drone if you are off a few degrees, but not if you are off by 45 degrees or more in weak signal situations.

 I have done my own testing to see if the boosters made a difference and they clearly function as advertised. I sent my Spark out until it reached the limit of reception and it started an automatic return home because of the weak signal. I only had one bar of signal strength indicated at that point. I slipped the boosters on the controller antennas, pointed it at the Spark and I now had three bars indicated. I canceled the return to home and sent the drone out again, passing the point where I'd lost signal and going another 2,000 feet before dropping to one bar again. I've tried this multiple times with the same result.

 This booster is compatible with:

The main differences between DJI Goggles Racing Edition (RE) and DJI Goggles?

1. Full compatible with Dji Mavic 2 series
2. In addition to the 2.4GHz digital transmission band, the new DJI Goggles RE also supports the 5.8GHz band, which can avoid the usual inference on the more crowded 2.4GHz.
3. DJI Goggles RE has redesigned the internal linear polarized omnidirectional antennas and added new external Pagoda antenna, a 5.8GHz single-frequency omnidirectional left hand circularly polarized (LHCP) antenna.
4. DJI Goggles RE has restructured the radio communication strategy and video decoding algorithm to lower transmission latency to 50 ms* (with wireless transmission latency of less than 10 ms), ensuring smooth and reliable video transmission and avoiding video lag and disconnection from the digital video transmission system when operating in a normal environment.
5. DJI Goggles RE supports analog transmission at any integer frequency between 5.650~5.925 GHz and analog video storage on a Micro SD card.
6. DJI Goggles RE can store digital video on a Micro SD card.
7. DJI Goggles RE supports local video playback and Sphere pano viewing, allowing users to turn their head to get a 360° view of the Sphere pano.
8. The facial pad has been redesigned and the headband has used new replaceable leather materials to make it even more comfortable to wear.
9. *When tested with a 480p video feed.