The HF antenna in the old long wire systems could cause a spark if the conductor broke, but the modern Leading edge type are most unlikely to have this problem. The damage to persons is the more likely, as HF can cause a nasty burn if you touch the antenna in the wrong spot.
If you think about the conditions needed to start the engines, ie air flow, atomised fuel and a very high energy igniter, the the likley hood of having/causing a fire is extremely remote. try an experiment at home and see how hard it is to get kero to burn with a match.