Air OHQ and Air Defence

[Muad89]

Hi there, (got like 50h in game at this moment)

I have a simple question to manual:

6.1.15. AIR OHQS AND LEADER SKILLS
p. 372

Anti-Air Tactics
This Skill will increase the aim and placement of Anti-Air weapons
like SAM Launchers and Flak Guns (Increase Attack Value of ground
Defenders versus Air targets).

Air OHQ
- can't have ground-based units even independent for air defence

Does it mean, the Air OHQ have impact in its range on other ground anti-air units around?
And going further - simple Air OHQ without air units can boost air defence just for being stacked with normal OHQ?

Thank you

[Soar_Slitherine]

The manual section is misleading - Anti-Air Tactics is for regular OHQs, not Air HQs.