The ball must cross the net between the antennae.
(The antennae extend to the ceiling! Often there aren't any antennae at U14 level, so the ball must pass between the posts)The ball crossing the net outside the crossing space can be played back onto court within the team hits, provided that:
The player does not touch the opponent’s court
The ball passes back outside the crossing space
The ball passing below the net is still in play until it has completely crossed under the net.
If the ball touches the net while crossing it, play continues
If the ball is hit into the net, play continues so long as the team has not already used their 3 hits.