In Finland I'd need CA with B1+B3 mostly and B1+B3+B7(+b20)for maximum performance.
Only b1+b7 or b3+b7 is not good enough since usually those b7 are too far away to achieve CA, so B1+B3 would help a lot.
And of course routerboard would need to have 1Gbit ethernet then to get speed out