I work in Guilderland, NY which is located just west of Albany, NY. We occasionally receive ambulance to hospital reports to Porter Medical Center in Middlebury on our repeater. The transmission comes over our repeater, so I assume that it's coming in on the input, which is 158.970. We never receive the hospital side of the conversation, so it would seem that maybe some service is using another repeater to communicate on one of Porter's licensed frequencies. Does anyone know anything further about who this might be?