musichead1029 said:lalumia should have said "the biggest competitive Top 40 station in the world in the 60s." Of course Radios Luxembourg and Caroline had big audiences - they were in artificially controlled (government-run) markets. Had real competition been allowed (essentially what the pirates were achieving), there would have been more choices and the audiences for the best stations would have been WABC-sized.
There were multiple pirates (Caroline, Radio London, etc. on ships and on old sea platforms) as well as legit Luxembourg. How many Top 40's did the New York metro have? Over parts of te 60's, there were a number of them, WMCA, WINS, WMGM but at any one time, no more than SE England and the London area had.