I'm just curious about what the range of the C4 and detonator is. For instance, could I plant some C4 in in the middle of Novac, and then run straight to Goodsprings, and then blow it up? Or would that not work?

Not sure on exact range but I'm pretty sure it would have to be within the active cell the game is split up into beyond that no idea I've never really used the stuff its expensive at theres little opportunity for traps.

How big is the active cell?