No idea, though unicycle friends have told me range often is an issue when mounting the sensor further from the bars than it would be on a traditional front wheel install on a bike, so you are probably right to be concerned.
What I can tell you is that the cable on a $12 Bell 150 is 35 inches long, I think that might reach if your trainer has a conventional rear wheel the cable actually needs to go in the forwards edge the display not the rearward however, so allow a little for that routing.
I can also caution they are somewhat fragile, and not to think you are going to cut and splice the cable if you break or wish to extend it, because under the rubber jacket it is nasty hair thin enamled wire, evil stuff like earbuds use. Eventually I'll chip out the gunk in the bar base and replace the entire run in my first, for the moment hoping my 2nd holds up a little while.
Last edited by UniChris; 06-08-19 at 05:48 PM.