Like I said:
I stand to be corrected,
I stand corrected....I guess the business model has changed---back in the 90's they were not flying under it that I know of.
Yes, it is not illegal---in fact I have flown under it while flying for KRON the NBC affiliate.
Will Prater is still around flying for CalFire. And yes most Bay Area pilots have flown under all the bridges apart from the Dunbarton rail bridge as it is too low.