That may have started WABC's decline but I believe it was WKTU's Disco format that finally did them in.
That's right, to the extent that KTU was the disrupter that moved all the contemporary listening to FM.
In Spring of 1976, the ranking was
WABC 9.1
WOR 8.1
WRFM 5.0
WBLS 5.0
WCBS (AM) 4.8
WINS 4.2
WPLJ 3.9
WMCA 3.5
WADO 3.3
WXLO 3.3
In teens it was WABC way ahead, followed by WXLO, WPLJ and WBLS tightly bunched and then WWRL and WPIX quite a ways behind.
WABC was dominant until mid 1978. In the October/ November book, WKTU went from a 1.2 to 11.3, and WABC fell to a still respectable 7.1. But it was now 4th in teens and third in 18-34.
By Fall of 1980, WABC was down to 10th with a 3.6, and KTU still had an 8.3. More important, WABC was down to 8th in 18-34 and 18-49. WNBC was beating it in teens and 18-34, and trouncing it in 18-49.
What happened was similar to what happened in a number of markets in the 70's... a really "special" FM only format went on and the young adults migrated and never came back.
The most extreme case of this I ever saw was the Puerto Rico market, where in 1978 the FM share among all stations combined was less than 15 share points. One of those "special" stations went on FM, and by April of 1979, that single station had a 33.5 share and the FM band had over 55 shares... and this in a market with over 30 signals on AM and FM. AM never recovered even one single share point after that.
In all such cases, there was a strong and exclusive FM cume magnet. There is nothing on HD that matches those two qualities of "strong" and "exclusive".
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