After playing a quick 3v3 with Oli the other day, the discussion came around to Advent's Iconus Guardian Repulsion.  Although this same topic is come up again and again, he seemed to have some very different opinions that I knew weren't correct when it comes to countering Repulsion as an Advent player.

1.  Illums are still in range while being repulsed.  FALSE.  Even with fully upgraded beams (meaning a 12% range increase), Illums come no where near to being in range of a Guardian currently using Repulse.  It is well known that Illums have the shortest range of all the lrfs, which does not bode well when it comes to an Advent vs Advent situation.  The picture below shows a Guardian currently using Repulse, with the green Illum being pushed away.  Clearly, it's not in range of the purple Guardian.

2.  Disciple's Steal Antimatter ability is still in range while being repulsed.  FALSE.  The Steal Antimatter ability has about the same range as an Illum's fully upgraded beams, again meaning that it is not in range while being repulsed.  Although when in range it may be useful, all your opponent has to do is use the same tactic, and an endless swapping and replenishing of antimatter ensues.  The picture below demonstrates this exact thing between the green disciple and the purple Guardian. 

Oli also talked about using Radiance's Detonate Antimatter, which, although I agree will get the job done, it will in no way be effective against multiple Guardians, seeing as the Radiance itself will not be able to target every Guardian fast enough.  This leaves few counters for an Advent player being harassed by Repulsion.  Either build your own Guardians, or bomber/fighter spam, which even becomes useful later game.  However, in a quick pinch, there are few ways to effectively counter Repulse, meaning you better have the tech already researched just in case your opponent decides to try and pull a fast one on you.