I drive the areas often, I live in southern Lakeville, now that theres towers in the area turning on im constatly check areas, Apple Valley is really weird though, I'm fairly sure the 4G I picked up nearer the zoo was from the water tower as you think, but I can figure out where the signal is comming from near Eastview hs, I'd say its from the big tower near the HS, but i dont any 4G signal, parked next to it on the west. Its like it's only barely on, and only directionally to the east.
Ugh this forum doesnt play nice with my Internet browser or swift key keyboard. . . I read the posys often, but it's such a PITA to post from my phone and rarely do I use a real computer anymore, so sorry for the broken wording and grammar, ill try and post from my laptop more. . .