My guess this was a typo on an old map. The predecessor to WTVN is WAIU, which operated on 640 from the 20's through the late 40's; when the station traded around frequencies to get 610, 640 landing in Akron. The WAIU calls disappeared before the war, but, by then, they may have already ended up on the topos & were just carried through.
I have WAIU listed at 500 watts in '32, suspect when they moved to 610 after the war the 4 tower box array was built, with the fifth tower daytime.
The present site is six towers and located due south of downtown near Route 23 and I-270. Pair of three towers running E to W, the NW tower is much taller than the others because it once housed WTVN-TV and 96.3; 93.3 is now on that tower.