I think that biters destroyed the antenna but got the following error message. halts that game - might be able to trap the error? Have been using this mod frequently - I like how no signal is generated when there is a power cut so rather than a rail signal that will only allow a train to pass if less than a certain number you have to wire a combinator to handle the possibility.

Error while running event on_tick (ID 0)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
FLAN/control.lua:158: in function 'update_antenna'
FLAN/control.lua:205: in function <FLAN/control.lua:202>