All these 1 star ratings are an indication of poor hobby pilots.
Completed a test:
Micro UAS: DJI Spark
Location: Lake Marion, Lakeville MN
Altitude: 250' AGL
DJI Go 4: Apple iOS connected with OTG cable
Previous Stock Max Distance: 5,500'
Extender Distance: 8,500'
NOTE: I turned around at 8,500 feet without breaking link. There was a tail wind and I was at 60%. Needed to ensure safe landing at LZ. But at confirmed 3,000' added, that earns 5 stars for doing what it claims.
1. The parabolic reflectors makes this a 'point-to-point' antennae. It is no longer omni-directional. Make sure to orient the reflectors in the direction of your UAS.
2. It seems that the Controller Antennas (stock) need to be fully extended. I had poor results when bending them like I usually do.
3. I wish the reflectors folded up nicely for storage, like a clam. Instead, the brackets impede each other.
4. The brackets fit quite snugly on the stock antennae. Be careful, I could easily see breaking the antennae or reflector if you are too forceful.
Who should buy this? Those who want to maximize flight distance from your LZ.