For months now, Hillary Clinton and her Democratic allies have been hammering Donald J. Trump on the air, and Mr. Trump has barely bothered to hit back at all. But as he emerges from the Republican convention, Mr. Trump is at last receiving some meaningful air support: Rebuilding America Now, one of the “super PACs” supporting his campaign, is releasing four new ads — including a 60-second commercial, “America Soaring” — in swing states on Monday.

THE MESSAGE American steel, American jobs, America first. It’s the cinematic, polished version of Mr. Trump’s message, with soaring vistas of skyscrapers and bridges, steel drills piercing thick slabs and pensive workers in hard hats, all in super-slow motion. A soothing, deep-voiced narrator asserts that skilled factory workers and tradespeople have seen their jobs shipped overseas, but that “we can turn it around.”

The steel motif gives a story to the ad’s optimistic message: American steel once provided the skeleton for the Empire State Building, it says, and now it can be used to rebuild the country. Or as the narrator says, parroting Mr. Trump: “We’re going to make America great again for everyone.”

THE TAKEAWAY Despite resembling a commercial for a steel industry trade association, the ad offers a positive rebuttal to the many negative ads raining down on Mr. Trump. It takes a while to get to that point; the narrator never mentions the candidate, and only a blue-and-white “Trump: Make America Great Again!” logo makes explicit whom the ad is supporting. But while the ad is consistent with Mr. Trump’s central message, its hopeful tone could be more palatable to voters put off by Mr. Trump’s slashing style and dire warnings.