SFO Freqs.
Both aircraft were on 121.5. That's standard SFO tower freq.
I have to add that every time I've been given the 101 transit clearance, the controller has pointed out the traffic to me (often still just lined up prior to roll on 28R), and has also informed the heavy waiting for departure. More often than not the airliner has me in sight while still on the ground.
28R is used primarily for heavies heading for the orient or Australia, On a typical day, the runway is not that busy.
On the rare day that the wind is really blowing, all departures are on the 28s, and 101 corridor clearances are not permitted. With the the turbulence in the rotor off of San Bruno mountain in those conditions, I wouldn't want to be there anyway.