I have just recently bought a reanault megane 1998. When switching the stereo on the aerial used to go up straight away.
I went away for the weekend and the car was left standing, I got back in the car to come home and it hasn't worked since. The weather was pretty rough so I don't know if it is flooded something

I would start by checking fuses

I have already checked the fuses that's the first thing I did