Looking at the coil sizes in the networks shown in pic 10 and 11, I'm guessing the left contactor might be switching between the day and night antenna coupling networks, and the right contactor switches in a smaller detuning network for when another tower is running in non-DA emergency/maintenance mode. *Or*, if the tower shown is one of towers that is powered in only one mode, then the three positions/networks might be (powered) NDA network, (powered) DA network and detuning network (when the station is running the "other" pattern on the other towers).
It's a showcase site, no matter what. Yay to Necrat for the pix.