On HF we used a high pitched shouty voice.
Dunno if it worked.
Back in the day before SSB, we had a male dispatcher who had a rather high on air voice, he could be mistaken for a female if you didn't know otherwise. His was the best voice that could be understood over HF. SSB reduced everyone to sounding like rain in a tin pisspot.
Playing amateur radio, female voices are often easier to understand on a noisy link, although we're not usually using AM so the characteristics will be different to VHF airband.
I'd say the same for VHF also.