  We study the massless charged spectrum of U(1) gauge fields in F-theory that
arise from flux breaking of a nonabelian group. The U(1) charges that arise in
this way can be very large. In particular, using vertical flux breaking, we
construct an explicit 4D F-theory model with a U(1) decoupled from other gauge
sectors, in which the massless/light fields have charges as large as 657. This
result greatly exceeds prior results in the literature. We argue heuristically
that this result may provide an upper bound on charges for light fields under
decoupled U(1) factors in the F-theory landscape. We also show that the charges
can be even larger when the U(1) is coupled to other gauge groups.
