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you cant use fm on cb or hf for that matter, it excedes bandwith limitations set by the fcc. uhf/ vhf useage is most common. police use fm, as well as 2m operators.
The range on FM isn't significantly different from the range on any other mode. FM has a greater bandwidth, however, which is why it's used mostly on VHF and above.
There's a narrow area at the high end of ten meters where FM is sometimes heard (I operate there once in a while just to see that my rig still works in that mode).
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