Radio update question

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might sound like a dumb question:
do I need to flash a radio separate to update it, or will it update when I use the latest rom. So far, I have only used modaco desire roms from day one rooting of the nexus. I use at&T, so maybe the radio updates arent necessary?

Well, if the ROM is cooked with the radio update, you don't need to do it separately... else, it is recommended... especially if your are using a newer ROM with the latest RIL libraries [for stability and compatibility sake]...