Topband: QRPers calling CQ in the SP ?

[Tom W8JI]

> Of course, any frequency ending in a zero is almost guaranteed to have a
> constant broadcast station harmonic. I almost always hear them here,
> especially at night. And very often, that BC carrier is stronger than
> stations zero-beat with them calling CQ! Better to be slightly off of 
> zero,
> if you're QRP and want to be heard.

I could never understand that either. Anything USA on the 10's is likely to, 
sometime or another, have a mixing product or harmonic.