Joe,
just throwing this out there too, but i have noticed on a couple of stations here in indiana, there is a bugging kinda echo on their broadcasts this is on FM radio.......but im wondering, these same stations are broadcasting in "HIGH DEFENITION"
so maybe thats it. i have noticed alot of overlap too in stations, another station just faintly in background, while list to another........... not really an echo on that one though.....

im assuming by your post that you dont hear/notice the echo when playing cd player, only when listening to radio........