All I had to do was Google it. Dial Global is the syndicator. There is a press release on their website. Hits Now! is the "channel", i.e. Hits Now! is the CHR channel on the Dial Global satellite feed, among several other format channels. They are a major syndication conglomerate, having eaten Jones Radio Networks and several others recently. They also syndicate the JACK-FM format. A local station may pay them to air the content, or it may be a swap deal where they agree to air Dial Global's spots and send back affidavits to certify that they played.
Some stations could play Hits Now! 24/7 assuming there are local breaks or "optionals", where the syndicator sends down a seg tone - usually 20Hz or 25Hz and almost undetectable by human ears and most likely not audible over broadcast radio - and then goes silent or feeds a PSA so the station can insert its own local commercials.
Some stations might choose to go to syndication for certain dayparts like middays, nights, and overnights, which are typically programmed for listener retention - i.e. times when people are expected to turn off their radios for work or sleep. The idea is, if the music and the personality are interesting enough to keep you listening, you'll turn your radio off with it set to that station. When you turn it on after work or in the morning, it's "drive time" when more people are listening, so that's when the station puts their most important programming (which may be local so they can sell more spots at a higher rate). Stations can save money by not having to pay a local jock.
See also: True Oldies, Smooth Jazz (which recently canned Rene Miller of Georgia Lottery fame and expanded syndicated programming to fill her midday slot)
WAY TO GO NUDGE! Once I got over how annoying he is to someone that's not in his demographic, I realized his show was EXCELLENT and how INCREDIBLY talented he really is.