This card say that all "range combat requirements" are to be negated for all shots after the use of this gear on that turn. What are those requirements?

Next time, place this under rules...

As of QBA, those requirements are:
- Units not in front arc, can still be hit.
- Blocking Terrain will be ignored when making shots
- Unit Bases are ignored when making shots
- Electronic Camouflage is ignored when making shots

Remember that this also counts for opponent units targeting the unit using Queen Bee Ammo...