[Lagerfeldt]

Radio is all about length: short & sweet - and getting right to the point.

Mix wise: lead vocals up, be sure to control those s- and t-sounds in the vocals. Mono tends to sound better (= louder), and be sure to check for phase problems. Or just mix right the first time around, a special radio version won't be necessarily be called for.

Mastering wise: same eq/comp settings (perhaps minding the subs and super highs) but less digital limiting or digital clipping may sound better on many commercial radio stations. As mentioned above, hard limiting/clipping will not make things better on air.

I also work for the Danish Broadcasting Coporation (Denmark's biggest radio stations), and even on the public stations (=less compression) excessive subs/highs and hard digital limiting/clipping will make things a lot worse.