I had the (immense) privilege of working Paul Lieb (SK) KH6HME from Palos Verdes, CA portable several years ago on 2Meter SSB. All the credit goes to the duct, of course. My actual home location is shielded by a BIG hill and Palos Verdes peninsula here in So. Cal, so I packed up equipment and drove to the bluffs of Palos Verdes, with a clear shot over the ocean. A simple 5 el 2 Meter Yagi on a 10' of mast, and 35 watts SSB, I was able to talk to Paul as if he were standing beside me. When the duct is open and well formed, (Usually late July) it will support ALL modes of transmission (AM, FM, CW, SSB, etc.) often through 10 GHz. I heard his (lower power) beacons on 70 cm and 23 cm, clear as a bell at the time. But no, I haven't personally worked "FM repeater" to Hawaii, although many have, often through the AA6DP 2 Meter repeater on Catalina Island, "26 Miles across the sea" from mainland Southern California.