The OpenWrt One has a third antenna for Zero-wait DFS OpenWRT One only allows 2x2 MIMO 5GHz - #7 by castillofrancodamian
Not sure if the Flint 2 has this as well (?) - This suggests so https://wikidevi.wi-cat.ru/GL.iNet_GL-MT6000_(Flint_2)
The OpenWrt One has a third antenna for Zero-wait DFS OpenWRT One only allows 2x2 MIMO 5GHz - #7 by castillofrancodamian
Not sure if the Flint 2 has this as well (?) - This suggests so https://wikidevi.wi-cat.ru/GL.iNet_GL-MT6000_(Flint_2)