As far as 1580 KHEP-AM is concerned, I noticed sign-off yesterday on the first day of March was 7:03 P.M. which I believe is a little late for legal sign-off for the month of March. Then again, they didn't sign-on until well after 7:30 A.M. this morning so that station is all over the map!
A little late indeed as their license specifies sign on 6:45a, and sign off 6:30p for the month of March. In that 15~Eighty doesn't have PSRA or PSSA, the Nurse and I suspect their lamptimer was built in Kenosha.