I'll presume KHSV in Las Vegas. If so, from Wiki...
"On June 1, 2022, MeTV was moved from KLAS-TV's subchannel 8.2 to channel 21.1, displacing H&I as the main affiliate channel to subchannel 21.2, as well as moving Decades to subchannel 21.6."
Subchannel means over-the-air broadcasts. Meaning, KHSV switched Decades from subchannel 21.3...which is the channel Cox puts onto cable...to subchannel 21.6.
It appears KHSV broadcasts a lot of retro channels over-the-air: Antenna TV, Circle, Decades, H&I, MeTV and Start TV.
You can still watch Decades with an antenna...maybe even get rid of cable!