Not knowing anything about the stock antennas it would be hard to say if any of the aftermarket antennas from China with X amount of DB gain is any better. Assuming the stock antennas are just that......STOCK and 3 db gain with aftermarket would be noticeable but not to the point making worthwhile tearing your controller apart and screwing up your warranty if you still have one. I plan on using a 9 turn 5.8GHz Helical antenna, Circular Polarization that I just happen to have for the 5.8 antenna. This should be a lot better then stock antennas as it is directional with a 40 degrees beam. This is real beam width at highest gain. I bought this antenna in 2015 and used it on my Yuneec Q500. It out performed FPVLR.coms 4.25 turns 5.8ghz helix antenna by a lot. Funny thing is the guy who made them lives in Poland to LOl

