I recall hearing some audio over top of the regular audio, they were obviously setting up for a remote broadcast, which is exactly what these links are used for. Of course that means that you'll only hear them when they are going to do a remote broadcast, which could be pretty rare, they don't leave these things on 24/7 (well the usual suspects on 25910/25950/25990 seem to, which is unusual). So you need the intersection of the link being on the air, as well good propagation.