There are only 3 Knoxville sirens left standing. 1 thunderbolt on Dunbar Street overlooking the old knoxville College.
There are 2 model 5's in South knoxville. Maryville Pike and Beech Street on the old School property.
Most of the thunderbolts have been saved and refurbished in the hands of collectors. Some, we have no idea where they have disappeared to.