For the past 2 months WABC in NYC at night has some kind of ANNOYING
warbling 200-400 hz "warble" under it.
Its visable on both sides of the center frequencey and cant be knocked out
with offset tuning with a narrow filter

Equipment R-390, Drake R-7
Antenna homebrew 6 foot shielded loop, balun

-Joe (NOSPAM)