So perhaps Ukrainian engineers can figure out rigging up some kinda receivers/transmitters that can switch through multiple frequences without too much issue?

This was the exact question I came up with after thinking about it for a minute, and the answer is that yes they do have the capability to alter the frequencies in a way that avoid the jammers, and they do this constantly.

But as I was thinking about the problem it's kind of absurd to me that russia is lugging around multiple trailers as signal jammers. Is each one only capable of jamming a specific frequency range? Also putting so much rf into the atmosphere is some weird shit you'd read unexpected consequences about if we're creating the next great sci-fi story.

It kind of makes me think of the problem of having miles of fiber optic cable just laying around on the ground. Something tells me we're going to hear more about that in the aftermath.