pathfinder 1e – Is there a way to increase the Battlefield Presence “aura” size of the paladin archetype Holy Tactician?

I was wondering if there was a core pathfinder method to increase the size of the “aura” that the Holy Tactician 3rd level ability grants. I am not looking for a combat application, but a out of combat one as the only teamwork feats I plan on sharing are stealth and favored terrain based. Best option is a reasonably priced magic item (10k), but while feats are tight I could spend ONE for this. I might even consider a level dip into something.