We are aware that 91.5 still has a problem
It could be interference - there are many frequencies on that Laughlin tower, and our engineer suggested this - or it could well be our own equipment. We have been rebuilding, shoring up, and backing up out studio-transmitter-links (STLs) so that they provide a steady, robust signal on all our frequencies. We had a failure a couple of weeks ago. We installed backup units while we rebuilt the originals. We are in the process of installing the rebuilt units and letting the backups be backups, but we can hear over the past couple of days that there is still one or more problems, especially causing a staccato signal on 91.5.
We regret it, deeply. What we are doing is trying to solve it with rebuilt equipment instead of brand new, because brand new costs somewhere between 5-10 times as much. If we can't accomplish it with that approach, we'll buy new stuff. But if we do, there goes our surplus. Then other projects - like the Ukiah Signal Project - go off the front burner. Tradeoffs.