Harder to shoot vehicles down in the following ways: (This is not a 100% complete list, just the Sheep highlights)
~Vehicle lock ons won't work if the enemy is "Below Radar", but infantry lock ons will function as usual. (best change ever. it worked well in Bf3 and I never understood why they took it away in BF4)
~Fixed the "get hit by an RPG and flip upside down in chopper" problem.
~Hits via laser desig. no longer 1 hit now, but saw an increase in range.
Mobile AA vehicle saw an all around nerf against everything which I'm sure we're all happy about.
But they reduced the range of chopper rockets across the board. They'll have to get a bit closer now. Stinger/Igla saw a damage buff and distance to lock buff but travel speed reduction
IMO this is a quality of life improvement for chopper pilots mostly. Below Radar actually makes chopper fights more interesting.