Remove radio and check that all leads are in correctly, then it is probably down to an earthing problem, put it on MW and put on the indicators if they interfere with reception it is an earth, this can be BODGED by connecting a slim earth wire to the back of the unit and finding a good earth on the dash, lights etc and there you go, Alternatively get a cheap aerial from any car spares plug that in and stick it in the engine bay by winscreen wipers fully extended not ideal but it will work. Keep us updated