"Those are PLed to reduce the crud from power lines and other RFI."
Actually no, repeaters use PL to reduce interference from other areas of the country and the world where our repeater inputs are simplex. I've heard plenty of European DX where you'd least expect simplex, the band plans vary by ITU region. The ARRL publishes a suggested PL "band plan" showing the suggested PL tones by region. BTW, in some countries 6M ham is prohibited, the band is used by Land Mobile and military so when there's intercontinental DX you can hear just about anything.
BTW, FISTS will wipe that SMIRK off your face!
"That's, ah say... that's a JOKE son!"
Senator Claghorn, Allen's Alley
Gee, I must be getting old if I can remember Foghorn Leghorn's roots in a radio show. (;->)