over Easter my family and I drove to Mungo National park- another story and pictures

-about a 1000 klicks from home
anyway I left my car radio on my usual radio station WS FM-which no doubt tells you my age and probably suggests that I am indeed one of those who bought tickets to the Simon and Garfunkfel show in June
but to come back to the point of this post, every so often , once I was past Hay, I would hear a burst of music from a radio station so far away it just had to be caused by an ionising tunnel caused by a meteor. And there were plenty of these through the day. Some were startlingly long -over several seconds
anyway obviously this is a very effective way to monitor meteors..but the question is how does one automate this?
so the task is
find a faraway FM station -which can be done easily enough- and record-somehow automatically-every time the radio comes on
above the level of noise-and of course each time this happens it is presumably a meteor... and do this 24/7 especially during known meteor showers (but who knows what one will find at other times?)
anyone of you clever electronic people have an answer? low cost I might add
Narayan