So DCA controller asked everyone on 134.35 (DCA Heli) to switch to 133.525 on Monday night after a PAT H-60 had a stuck mic. I guess that's the heli UHF freq? A few months ago the controller asked all the helicopters on 134.35 to switch to 257.6 (TWR UHF) for the same reason, so maybe they got a UHF freq for helicopters since then? FWIW, the controller was simulcasting on 134.35 and 133.525 for the few minutes when everyone was switching over.